JP2009271192A - Panel for information display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a panel for information display which attains enhancement of fraction nondefective of a panel and the narrow frame of the panel, by sandwiching and laminating the overall panel part, by using a film having moisture preventing properties, in place of using a sealing agent for moisture prevention. <P>SOLUTION: In the panel for information display, since both of at least connection terminal parts electrically connecting electrodes 13 and 14 on panel substrates 11 and 12 to conduction wiring on separate substrates 16, on which driving ICs 15 are mounted, and the panel part are laminated by using the film 17, having the moisture-preventing properties in a single lamination step, to dispense with a sealing part in the substrates, the panel for information display wherein the fraction nondefective of the panel is enhanced and which has a narrow frame structure is obtained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an information display panel that fills a display medium between two electrodes-attached substrates, at least one of which is transparent, and displays information such as images by electrically driving the display medium.

  As an information display device that replaces a liquid crystal display device (LCD), a display medium configured as a particle group including a chargeable particle is filled between at least one transparent substrate with electrodes, and an electric field is applied to the display medium from the electrodes. There is known an information display panel that displays information such as an image by moving a display medium.

  In the conventional information display panel including the information display panel using such a display medium, as shown in FIG. 10, for example, electrodes 53 and 54 (here, line-shaped electrodes) formed on the front substrate 51 and the rear substrate 52 are used. In order to prevent corrosion, the peripheral portion of the panel formed by bonding the front substrate 51 and the rear substrate 52 is sealed with a moisture-proof sealant 55, and further, a flexible wiring substrate on which a driving IC 56 is mounted 57 is connected to the front substrate 51 and the back substrate 52, respectively, and then the moisture-proofing agent 58 is applied also to the connecting portion between the flexible wiring substrate 57 and the front substrate 51 and the back substrate 52. In addition, when the driving IC is directly mounted on the panel substrate (COG: Chip on glass or COF: Chip on film) and the flexible wiring board is connected, a moisture proofing agent is also applied to the peripheral part of the driving IC and the flexible wiring board connecting part. It was applied.

  The conventional information display panel includes a coating process in which a moisture-proof sealant 55 is applied to the periphery of a panel formed by bonding the front substrate 51 and the back substrate 52, and a flexible wiring substrate 57 on which a driving IC 56 is mounted. In order to perform the connection process of connecting to the front substrate 51 and the back substrate 52 respectively, and the coating process of applying the moisture-proofing agent 58 to the connection portion between the flexible wiring substrate 57 and the front substrate 51 and the back substrate 52, the information display panel is provided. A moisture-proofing agent is formed in a predetermined process on each of the front substrate 51 and the back substrate 52 constituting the same, and the process related to moisture-proofing is duplicated, and a defect occurs in each process related to moisture-proofing. There was a thing. In addition, since the conventional information display panel is provided with the sealant forming portions on the front substrate and the rear substrate constituting the information display panel, the frame portion which is a non-display area in the information display panel is widened. There was also a problem.

  In the present invention, instead of using a sealant for moisture prevention, the entire information display panel is sandwiched and laminated with a film having moisture resistance, thereby improving the panel non-defective rate and for displaying information with a narrow frame structure. The purpose is to provide a panel.

  In order to achieve the above object, an information display panel according to claim 1 of the present invention includes a display medium filled between two substrates with electrodes, at least one of which is transparent, and the display medium is electrically driven. An information display panel for displaying information such as an image, an electrode of a panel unit in which two substrates with electrodes are bonded to each other, a conductive wiring on another substrate on which a driving IC is mounted, In the information display panel configured to electrically connect the at least one electrode, the connection terminal portion for electrically connecting at least the electrode on the panel substrate and the conductive wiring on another substrate on which the driving IC is mounted, and the entire panel Both of them are laminated with a moisture-proof film.

  In order to achieve the above object, an information display panel according to claim 2 of the present invention is such that a display medium is filled between two substrates with electrodes, at least one of which is transparent, and the display medium is electrically driven. An information display panel for displaying information such as an image, an electrode of a panel unit in which two substrates with electrodes are bonded to each other, a conductive wiring on another substrate on which a driving IC is mounted, In the information display panel configured to electrically connect the driving IC, another substrate on which the driving IC is mounted is a flexible substrate, and the electrode on the panel substrate and the driving IC on the flexible substrate are the panel substrate. After being electrically connected via the connection terminal portion provided on the upper side, the flexible substrate is bent on the back side of the panel portion, and then the entire panel composed of the panel portion and the flexible substrate is moisture-proof. Characterized in that it is laminated with a film having a.

  In order to achieve the above object, an information display panel according to claim 3 of the present invention includes a display medium filled between at least one of two transparent substrates, and the display medium is electrically driven. An information display panel for displaying information such as an image, which includes a connection terminal portion extending from a drive IC connected to an electrode of a panel in which two substrates with electrodes are bonded to each other, and a drive circuit mounted In the information display panel configured to be electrically connected to another substrate, the connection terminal portion extending from the driving IC connected to the electrode of the panel portion, and the other substrate on which the driving circuit is mounted The entire panel portion including the connection terminal portion electrically connected to the substrate is laminated with a moisture-proof film.

    In order to achieve the above object, an information display panel according to claim 4 of the present invention is such that a display medium is filled between two substrates with electrodes, at least one of which is transparent, and the display medium is electrically driven. An information display panel for displaying information such as an image, which includes a connection terminal portion extending from a drive IC connected to an electrode of a panel in which two substrates with electrodes are bonded to each other, and a drive circuit mounted In the information display panel configured to electrically connect to another printed circuit board, the other circuit board on which the drive circuit is mounted is a flexible circuit board, and the connection terminal on the panel circuit board and the conductive wiring on the flexible circuit board Are electrically connected via connection terminal portions provided on the panel substrate, and then the flexible substrate is bent and arranged on the back side of the panel portion, and then the panel portion and the flexible substrate are configured. Whole panels is characterized in that it is laminated with a film having a moisture-proof.

  As a suitable example of the information display panel of the present invention, the moisture-proof film is a moisture-proof laminate film subjected to an antireflection treatment, and the display medium is a group of particles containing chargeable particles. Are driven by an electric field applied from a counter electrode formed by electrodes of two substrates, and a plurality of cells in which a space between substrates filled with a display medium is partitioned by partition walls There is that.

  According to the information display panel of the first aspect of the present invention, the electrode on the panel unit in which the two electrode-attached substrates are bonded to each other and the conductive on another substrate on which the driving IC is mounted. In an information display panel configured to electrically connect wiring, at least a connection terminal portion and a panel for electrically connecting at least an electrode on the panel substrate and a conductive wiring on another substrate on which a driving IC is mounted Since both of them are laminated with a film having moisture resistance, the conventional method is used by laminating the connection terminal portion and the entire panel with a film having moisture resistance instead of using a sealant for moisture prevention. It is possible to eliminate the duplication process related to moisture proof that has caused a defect and to complete the process by a single laminating process, and to eliminate the need for a seal portion in the substrate. Therefore, the panel non-defective rate can be improved and an information display panel having a narrow frame structure can be provided.

  According to the information display panel of the second aspect of the present invention, the electrode on the panel unit in which the two electrode-attached substrates are bonded to each other, and the conductivity on another substrate on which the driving IC is mounted. In the information display panel configured to electrically connect the wiring, another substrate on which the driving IC is mounted is a flexible substrate, and the electrode on the panel substrate and the driving IC on the flexible substrate include: After being electrically connected through the connection terminal portion provided on the panel substrate, the flexible substrate is bent and arranged on the back side of the panel portion, and then the entire panel composed of the panel portion and the flexible substrate is moisture-proof. Because it is laminated with a film having the property, instead of using a sealant for moisture prevention, the entire panel is sandwiched with a film having moisture resistance so that the conventional method is used. In defect was not allowed to occur, abolished the overlapping process regarding moisture, together with dispensed in one lamination process, it is possible to dispense with the sealing portion of the substrate. Therefore, the panel non-defective rate can be improved and an information display panel having a narrow frame structure can be provided.

  According to the information display panel of the third aspect of the present invention, the connection terminal portion extending from the drive IC connected to the electrode of the panel in which the two substrates with electrodes are bonded to each other, and the drive circuit In an information display panel configured to be electrically connected to another substrate on which is mounted, a connection terminal portion extending from a driving IC connected to an electrode included in the panel portion, wherein the driving circuit is mounted Since the entire panel portion including the connection terminal portion electrically connected to the substrate is laminated with a moisture-proof film, the entire panel including the connection terminal portion is used instead of using a sealant for moisture prevention. By laminating with a film having moisture resistance, the duplication process related to moisture prevention, which has caused defects in the conventional method, is abolished and completed in one lamination process, It can be dispensed a seal in the plate. Therefore, the panel non-defective rate can be improved and an information display panel having a narrow frame structure can be provided.

  According to the information display panel of the fourth aspect of the present invention, the connection terminal portion extending from the drive IC connected to the electrode of the panel in which the two substrates with electrodes are bonded to each other, and the drive circuit In the information display panel configured to electrically connect to another board on which the circuit board is mounted, the other board on which the drive circuit is mounted is a flexible board, and the connection terminal on the panel board and the flexible board After the conductive wiring is electrically connected through the connection terminal portion provided on the panel substrate, the flexible substrate is folded and arranged on the back side of the panel portion, and then the panel portion and the flexible substrate are configured. Since the entire panel is laminated with a moisture-proof film, the entire panel including the connection terminal portion is provided with a moisture-proof film instead of using a sealant to prevent moisture. By laminating by being sandwiched arm had caused the failure in the conventional method, it abolished the overlapping process regarding moisture, together with dispensed in one lamination process, it is possible to dispense with the sealing portion of the substrate. Therefore, the panel non-defective rate can be improved and an information display panel having a narrow frame structure can be provided.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  First, a configuration of a charged particle movement type information display panel as an example of the present invention is described. In the information display panel, an electric field is applied to a display medium configured as a particle group including a chargeable particle sealed in a space between two opposing substrates with electrodes. 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 a charged particle movement type information display panel as an example of the present invention will be described with reference to FIGS. 1 (a) and (b) to FIGS. 4 (a) and 4 (b).

  In the example shown in FIGS. 1 (a) and 1 (b), at least two types of displays that are configured as a particle group including particles having at least optical reflectivity and chargeability, and have different optical reflectivity and charge characteristics. A medium (here, a white display medium 3W configured as a particle group including the chargeable white particles 3Wa and a black display medium 3B configured as a particle group including the chargeable black particles 3Ba) is formed of the partition walls 4. In each cell, a voltage is applied between the pixel electrode 5 with TFT (individual electrode) provided on the substrate 1 and the electrode 6 provided on the substrate 2 (individual electrode is shown here, but a conductive solid electrode may be used). The substrate is moved perpendicular to the substrates 1 and 2 in accordance with the electric field generated by the application. Then, as shown in FIG. 1A, the white display medium 3W is visually recognized by the observer and white dot display is performed, or as shown in FIG. 1B, the black display medium 3B is visually recognized by the observer. Black dots are displayed. In addition, in FIG. 1 (a), (b), the partition in front is abbreviate | omitted. The electrode may be provided outside the substrate, inside the substrate, or embedded in the substrate.

  In the example shown in FIGS. 2 (a) and 2 (b), at least two types of displays that are configured as a particle group including particles having at least optical reflectivity and chargeability and that have different optical reflectivity and charge characteristics from each other. A medium (here, a white display medium 3W configured as a particle group including the chargeable white particles 3Wa and a black display medium 3B configured as a particle group including the chargeable black particles 3Ba) is formed of the partition walls 4. In each cell, it is generated by applying a voltage between a pair of opposed electrodes formed by opposing and intersecting an electrode 5 (line electrode) provided on the substrate 1 and an electrode 6 (line electrode) provided on the substrate 2. The substrate is moved perpendicular to the substrates 1 and 2 according to the electric field. Then, as shown in FIG. 2 (a), the white display medium 3W is visually recognized by the observer and white dot display is performed, or as shown in FIG. 2 (b), the black display medium 3B is visually recognized by the observer. Black dots are displayed. In addition, in FIG. 2 (a), (b), the partition in front is abbreviate | omitted. The electrode may be provided outside the substrate, inside the substrate, or embedded in the substrate.

  In the example shown in FIGS. 3A and 3B, an example of color display in which a display unit (1 dot) is constituted by three cells is shown. In the example shown in FIGS. 3A and 3B, as the display medium, a white display medium 3W and a black display medium 3B configured as a particle group including all of the cells 21-1 to 21-3 including chargeable particles, And the red color filter 22R is provided on the observer side of the first cell 21-1, the green color filter 22G is provided on the observer side of the second cell 21-2, and the third cell 21-3 A blue color filter 22B is provided on the viewer side, and a display unit (1 dot) is configured by three cells, the first cell 21-1, the second cell 21-2, and the third cell 21-3. Yes. In this example, when performing color display, as shown in FIG. 3A, the white display medium 3W is moved in the first cell 21-1 to the third cell 21-3 to the viewer side. Thus, white dots are displayed to the observer, or, as shown in FIG. 3B, the black color is displayed in all of the first cell 21-1 to the third cell 21-3 on the observer side. By moving the medium 3B, black dots are displayed to the observer. In addition, in FIG. 3 (a), (b), the partition in front is abbreviate | omitted. Multicolor display can be performed by moving the display medium in each cell.

  In the example shown in FIGS. 4A and 4B, one type of display medium (here, the chargeable white particles 3Wa) configured as a particle group including charged particles having at least optical reflectance and chargeability is used. An electric field generated by applying a voltage between the electrode 5 and the black electrode 6 provided on the substrate 1 in each cell formed by the partition walls 4. Accordingly, the substrate is moved in the direction parallel to the substrates 1 and 2. Then, as shown in FIG. 4A, the white display medium 3W is visually recognized by the observer and white dot display is performed, or as shown in FIG. 4B, the color of the black electrode 6 is changed by the observer. The black dots are displayed by visually recognizing. In addition, in the example shown to Fig.4 (a), (b), the partition in front is abbreviate | omitted. In this case, only the back substrate is an electrode-attached substrate. The same can be done by using a transparent electrode instead of the black electrode and placing a black plate under the transparent electrode. Further, the same operation can be performed even if the color of the display medium and the color of the electrode are reversed from white / black.

  Although the charged particle movement type information display panel has been described above, the present invention is not limited to the display medium (for example, a display medium such as a liquid crystal, an electroluminescence type display medium, an electrophoretic type microcapsule type display medium, etc. It can be applied to an information display panel using the method.

  Hereinafter, a method for producing the information display panel of the present invention will be described. FIGS. 5A to 5D are diagrams for explaining an example of the information display panel of the present invention. 5A to 5D, line electrodes are formed on the front substrate 11 and the back substrate 12, and a partition is provided on at least one of the front substrate 11 and the back substrate 12 on which these electrodes are formed. After forming and filling the cell with the display medium, the two substrates can be aligned and bonded so that both line electrodes are orthogonally crossed to form a panel. In addition, for the display medium such as the microcapsule type or the electroluminescence type, the partition wall does not need to be formed, and the display medium with fluidity is such that the display medium is filled between the substrates after the two substrates are bonded together. Is also possible. In addition, apart from the method of manufacturing individual information display panels by individually laminating substrates in this way, a display medium is arranged on a large mother substrate on which a large number of individual patterns are chamfered. It is also possible to produce a mother panel in which mother substrates are aligned and bonded together, and then the mother panel is divided to produce individual information display panels. In addition, partition walls are formed on a large mother substrate on which a large number of electrode patterns for individual information display panels are chamfered, and then divided into individual information display panel substrates. It is also possible to produce individual information display panels by bonding.

After producing an individual information display panel using any of the methods, as shown in FIG. 5A, another substrate 16 on which a driving IC is mounted is connected to the individual information display panel. After that, as shown in FIG. 5B, at least the voltage on the panel substrate and the electrode connection terminal portion 18 for connecting the connection conductive wiring extending from the drive IC 15 of the substrate 16 on which the drive IC 15 is mounted. The information display panel of the present invention is obtained by sandwiching and laminating with a moisture-proof film 17 so as to cover the panel portion including the. In order to improve the visibility of the information display panel, it is preferable to use a moisture-proof film subjected to an antireflection treatment as the film having moisture-proof properties for laminating at least the display surface side panel.
Further, as shown in the top view shown in FIG. 5C and the side view shown in FIG. 5D, the substrate 16 on which the driving IC is mounted is folded back to the back side of the panel portion and is moisture-proof together with the panel portion. It is also preferable to laminate by sandwiching between the films 17 having the above.

In FIG. 6A, an anisotropic conductive film (ACF) is used in a portion surrounded by an ellipse, and driving ICs (COG: COG) in which electrodes on two panel substrates are provided on one panel substrate. A configuration is shown in which the connection terminal portion is connected to “Chip On Glass” or “COF: Chip On Film”. In this panel, the panel portion including the connection terminal portion is sandwiched and laminated with a moisture-proof film 17 to form the information display panel of the present invention shown in FIG. 6B. Here, lamination is performed up to a region including a part of the driving IC chip.
In addition, it is also preferable that the laminating region includes a connection terminal portion for connecting the driving IC chip and the driving circuit board 19 as shown in FIG.
Further, as shown in FIGS. 6D and 6E, after the driving circuit board 19 is folded and arranged on the back side of the panel part as a flexible board, all of the panel part and the driving circuit board are moisture-proof. It is also preferable to laminate by sandwiching between the films 17 having the above.

  In FIG. 7A, the driving IC and driving circuit mounted on the substrate 16 and the electrodes 13 and 14 on the two panel substrates 11 and 12 are formed using an anisotropic conductive agent. 2 shows an information display panel configured to be connected to connection terminal portions collected on the panel substrate. In this panel, the panel portion including the connection terminal portion on one panel substrate is laminated by sandwiching it with a film 17 having moisture resistance, and the information display panel of the present invention shown in FIG. 7B is obtained. . In the configuration shown in FIGS. 6A and 6B described above, the panel substrate on which the driving IC is mounted by COG or COF is used. The configuration shown in FIGS. 7A and 7B is as follows. As shown in FIGS. 6 (a) and 6 (b), the driving IC is made of a flexible circuit board (FCP) and a flexible cable mounted with TAB (Tape Automated Bonding) or TCP (Tape Carrier Package). The drive circuit wiring is connected to one side of the panel substrate by a conductive film (ACF).

The information display panel of the present invention eliminates the sealing agent used for moisture prevention in the information display panel of the conventional example shown in FIG. 10, and instead, the entire information display panel has a moisture-proof film ( (Hereinafter also referred to as “moisture-proof film”) 17 is laminated and laminated to prevent moisture, so that the following effects can be obtained.
(1) Since an information display panel can be produced without forming a sealant forming part, an information display panel with a narrow frame can be produced.
(2) Since the moisture-proof treatment at a plurality of locations of the connection terminal portion between the driving IC 15 and the electrode of the panel substrate can be performed at once, it is possible to improve the panel non-defective rate and manufacture the information display panel at a low cost. be able to.
(3) By laminating with the moisture-proof film 17, even when a glass substrate is used for the front substrate 11 or the back substrate 12, it is possible to prevent the glass from scattering when the panel substrate is damaged.
(4) The visibility of the information display panel can be improved by applying an antireflection treatment to the moisture-proof film 17 that laminates at least the display surface side panel substrate.
(5) In the case of an information display panel in which the front substrate 11 or the back substrate 12 is a resin substrate, the resin substrate used as the front substrate 11 or the back substrate 12 is given moisture resistance to the laminated film. A material with sufficient dimensional accuracy and low cost can be selected and used without considering the presence or absence of moisture resistance, and a highly accurate information display panel can be manufactured at low cost.

In order to manufacture the information display panel of the present invention, after the driving IC 15 is connected to the electrodes of the front substrate 11 and the rear substrate 12 on which the electrodes are formed, the entire display area, at least the driving IC 15 and the pixel electrode, A method of laminating by sandwiching with a moisture-proof film 17 so as to cover the connection terminal portion that takes the connection of is taken. In the conventional method shown in FIG. 10, a defect is generated in the process used, the redundant moisture-proof process is abolished, and a single laminating process is completed, and a seal part in the substrate can be made unnecessary. The information display panel can achieve the effects (a) to (e).
Further, according to the information display panel of the present invention, the information display panel having the configuration shown in FIG. 5B, FIG. 6B, FIG. 7C, or FIG. An information display panel that realizes improvement and narrowing of the frame.

  Hereinafter, each member which comprises the information display panel used as the object of this invention is demonstrated.

  As the substrate, at least one substrate is a transparent substrate on which the color of the display medium can be confirmed from the outside of the panel, and a material having high visible light transmittance and good heat resistance is preferable. The back substrate as the other substrate may be transparent or opaque. Examples of substrate materials include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene (PE), polycarbonate (PC), polyimide (PI), polyethersulfine (PES), acrylic polymer substrates Alternatively, a glass sheet, a quartz sheet, a metal sheet, or the like is used, and a transparent one is used on the display surface side. The thickness of the substrate is preferably 2 to 2000 μm, more preferably 5 to 1000 μm. If it is too thin, it will be difficult to maintain the strength and the uniformity of the distance between the substrates, and if it is thicker than 2000 μm, it will be a thin information display panel. Is inconvenient.

  Materials for forming electrodes on the substrate include metals such as aluminum, silver, nickel, copper, and gold, indium tin oxide (ITO), indium zinc oxide (IZO), aluminum zinc oxide (AZO), indium oxide, and conductivity. Examples include conductive metal oxides such as tin oxide, antimony tin oxide (ATO), and conductive zinc oxide, and conductive polymers such as polyaniline, polypyrrole, and polythiophene, which are appropriately selected and used. As a method for forming the electrode, a method of patterning the above-exemplified materials into a thin film by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, or the like, or a method of laminating metal foil (for example, rolled copper foil) Method) or a method of forming a pattern by mixing and applying a conductive agent to a solvent or a synthetic resin binder. The electrode provided on the viewing side (display surface side) substrate needs to be transparent, but the electrode provided on the back side substrate does not need to be transparent. In any case, the above-mentioned material that is conductive and capable of pattern formation can be suitably used. The electrode thickness is appropriately designed from the viewpoint of ensuring conductivity and light transmittance, but is in the range of 0.01 to 10 μm, preferably 0.05 to 5 μm. The material of the electrode provided on the back side substrate is not limited as long as it has electrical conductivity and does not need to be light transmissive. The thickness is also appropriately designed in consideration of electric resistance, but is preferably in the range of 0.01 to 10 μm, and more preferably in the range of 0.05 to 5 μm. In this case, the external voltage input may be superimposed with direct current or alternating current.

The shape of the partition provided on the substrate as required is appropriately set appropriately depending on the type of display medium involved in display, the shape of the electrode to be arranged, and the arrangement, and is not limited in general, but the width of the partition is 2 to 100 μm. The height of the partition wall is adjusted to 10 to 500 μm, preferably 10 to 200 μm, more preferably 10 to 100 μm, and particularly preferably 10 to 50 μm.
In forming the partition wall, a both-rib method in which ribs are formed on each of the opposing substrates 1 and 2 and then bonded, and a single-rib method in which ribs are formed only on one substrate are conceivable. In the present invention, any method is preferably used.
As shown in FIG. 9, the cells formed by the partition walls made up of these ribs are exemplified by a square shape, a triangular shape, a line shape, a circular shape, and a hexagonal shape as viewed from the plane of the substrate. And a mesh shape. It is better to make the portion corresponding to the cross section of the partition wall visible from the display surface side (the area of the cell frame) as small as possible, and the clearness of the display state increases.
Examples of the method for forming the partition include a mold transfer method, a screen printing method, a sand blast method, a photolithography method, and an additive method. Any of these methods can be suitably used for an information display panel mounted on the information display device of the present invention, and among these, a photolithography method using a resist film and a mold transfer method are suitably used.

Next, display medium particles (particles having optical reflectivity and chargeability) constituting a particle group as a display medium in a charged particle movement type information display panel which is an example of the present invention will be described. The display medium is used as it is as a particle group composed of particles for the display medium as it is, or as a particle group composed of other particles.
If necessary, the display medium particles can contain a charge control agent, a colorant, an inorganic additive, and the like in the resin as the main component.

  The particles for display medium have an average particle diameter d (0.5) in the range of 1 to 20 μm, and are preferably uniform and uniform. If the average particle diameter d (0.5) is larger than this range, the display is not clear. If the average particle diameter d (0.5) is smaller than this range, the cohesive force between the particles becomes too large, which hinders movement as a display medium.

Furthermore, in the present invention, regarding the particle size distribution of each display medium particle, the particle size distribution Span represented by the following formula is less than 5, preferably less than 3.
Span = (d (0.9) −d (0.1)) / d (0.5)
(However, d (0.5) is a numerical value expressing the particle diameter in μm that 50% of the particles are larger than this and 50% is smaller than this, and d (0.1) is a particle in which the ratio of the smaller particles is 10%. (Numerical value expressed in μm, and d (0.9) is a numerical value expressed in μm for a particle diameter of 90% or less.)
By keeping Span within a range of 5 or less, the size of each particle is uniform, and movement as a uniform display medium becomes possible.

  Furthermore, among the display medium particles used, it is important that the ratio of d (0.5) of the display medium particles having the minimum diameter to d (0.5) of the display medium particles having the maximum diameter is 10 or less. is there. Even if the particle size distribution Span is reduced, the display medium particles with different charging characteristics move in opposite directions, so the particle sizes of each other are close, and the display medium particles move easily in the opposite directions by the equivalent amount. It is preferable to be able to do this, and this is the range.

The particle size distribution and the particle size can be obtained from a laser diffraction / scattering method or the like. When laser light is irradiated onto particles to be measured, a light intensity distribution pattern of diffracted / scattered light is spatially generated, and this light intensity pattern has a corresponding relationship with the particle diameter, so that the particle diameter and particle diameter distribution can be measured. .
Here, the particle size and particle size distribution in the present invention are obtained from a volume-based distribution. Specifically, using a Mastersizer2000 (Malvern Instruments Ltd.) measuring instrument, particles are introduced into a nitrogen stream, and the attached analysis software (software based on volume-based distribution using Mie theory) The diameter and particle size distribution can be measured.

Furthermore, in an information display panel that drives a display medium composed of display medium particles in a gas space, it is important to manage the gas in the gap surrounding the display medium between the substrates, which contributes to improved display stability. Specifically, it is important that the relative humidity at 25 ° C. is 60% RH or less, and preferably 50% RH or less for the humidity of the gas in the gap.
1A, 1B, 4A and 4B, the gaps are defined as electrodes 5 and 6 (electrodes inside the substrate). The gas portion in contact with the so-called display medium excluding the occupied portion of the display medium, the occupied portion of the partition wall 4 and the seal portion of the information display panel.
The gas in the gap is not limited as long as it is in the humidity region described above, but dry air, dry nitrogen, dry argon, dry helium, dry carbon dioxide, dry methane, and the like are preferable. This gas needs to be sealed in an information display panel so that the humidity is maintained, for example, filling a display medium, assembling an information display panel, etc. in a predetermined humidity environment, It is important to apply a sealing material and a sealing method that prevent moisture from entering from the outside.

The distance between the substrates in the information display panel that is the subject of the present invention is not limited as long as the display medium can be driven and the contrast can be maintained, but is usually adjusted to 10 to 500 μm, preferably 10 to 200 μm.
In the information display panel of the charged particle movement type, the interval between the panel substrates is 10 to 100 μm, preferably 10 to 50 μm. Further, the volume occupancy rate of the display medium in the information display panel of the system in which the charged particles are moved in the gas space is preferably 5 to 70%, more preferably 5 to 60%. If it exceeds 70%, the movement of the display medium is hindered, and if it is less than 5%, the contrast tends to be unclear.

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

<Example 1>
As described above, the flexible wiring board 16 on which the driving IC 15 is mounted is connected to the respective electrodes (electrodes 13 and 14) of the glass front substrate 11 and the glass rear substrate 12 as shown in FIG. After the state shown in FIG. 5, as described above, the front substrate 11 and the back surface in the state shown in FIG. 5A using “CP leaf clear film manufactured by Fuji Plastic Co., Ltd., size 70 mm × 100 mm” as the moisture-proof film 17. The entire substrate 12 was sandwiched between moisture-proof films 17 and laminated to produce an information display panel having the configuration shown in FIG. The information display panel laminated with the moisture-proof film was placed in a constant temperature and humidity chamber at 40 ° C. and 93% RH for 100 hours and subjected to a moisture resistance test. As a result, any panel substrate (front substrate 11, rear substrate 12) However, no corrosion of the electrode occurred and no problem occurred.

<Example 2>
As shown in FIG. 6 (a), the electrode 13 of the glass front substrate 11 is connected to a connection wiring electrode (not shown) of the rear substrate 12 using an anisotropic conductive film, and is formed on the glass rear substrate. With the driving IC 15 mounted on the COG and the flexible wiring board 19 connected, a “CP leaf clear film manufactured by Fuji Plastics Co., Ltd., size 70 mm × 100 mm” is used as a moisture-proof film in FIG. An information display panel having the configuration shown in FIG. 6B is manufactured by sandwiching the front substrate 11 and the rear substrate 12 in the state shown in the figure, the driving IC 15 and the flexible wiring substrate 19 and sandwiching them with a moisture-proof film 17. did. When an information display panel laminated with this moisture-proof film is placed in a constant temperature and humidity chamber at 40 ° C. and 93% RH for 100 hours and subjected to a moisture resistance test, the electrodes on both the front substrate and the rear substrate are corroded. There was no problem.

<Example 3>
As shown in FIG. 8A, the driving IC 15 connected to the flexible circuit board 19 is separately COG-mounted on the electrode 13 on the glass front substrate 11 and the electrode 14 on the glass back substrate 12, respectively. The front substrate 11 and the back substrate 12, the driving IC 15 and the flexible wiring substrate 19 in the state shown in FIG. 8A using the “CP leaf clear film manufactured by Fuji Plastic Co., Ltd., size 70 mm × 100 mm” as the conductive film An information display panel having the configuration shown in FIG. 8B was manufactured by sandwiching the laminate with the moisture-proof film 17 so as to cover it. When an information display panel laminated with this moisture-proof film is placed in a constant temperature and humidity chamber at 40 ° C. and 93% RH for 100 hours and subjected to a moisture resistance test, the electrodes on both the front substrate and the rear substrate are corroded. There was no problem.

The information display panel of the present invention includes a notebook computer, an electronic notebook, a portable information device called PDA (Personal Digital Assistants), a display unit of a mobile device such as a mobile phone, a handy terminal, an electronic book, an electronic newspaper, an electronic manual ( Electronic manuals), electronic paper such as signboards, posters, bulletin boards such as blackboards and whiteboards, electronic desk calculators, display units for home appliances, automobile supplies, card display units such as point cards and IC cards, electronic advertisements, In addition to information boards, electronic POPs (Point Of Presence, Point Of Purchase advertising), electronic price tags, electronic shelf labels, electronic musical scores, and display units for RF-ID devices, various electronic devices such as POS terminals, car navigation devices, watches, etc. It is suitably used for the display unit. In addition, it is also suitably used as a display (so-called rewritable paper) that performs display rewriting by connecting to an external rewriting device.
In addition, it is used in places where sterilization is required, such as in food, pharmaceutical industry, medical care, etc., places where semiconductors, precision parts, etc. do not like dust, places where pressure or pressure is reduced, or places where corrosive atmospheres are filled. It is suitably used as a display device.
The information display panel driving method according to the present invention includes a simple matrix driving method and a static driving method that do not use a switching element in the panel itself, and a three-terminal switching device or a thin film diode represented by a thin film transistor (TFT). Various types of driving methods such as an active matrix driving method using a two-terminal switching element represented by (TFD) can be applied.

(A), (b) is a figure which shows the fundamental structure of the information display panel of the charged particle movement system used as the object of this invention. (A), (b) is a figure which shows the fundamental structure of the information display panel of the charged particle movement system used as the object of this invention. (A), (b) is a figure which shows the fundamental structure of the information display panel of the charged particle movement system used as the object of this invention. (A), (b) is a figure which shows the fundamental structure of the information display panel of the charged particle movement system used as the object of this invention. (A)-(d) is a figure for demonstrating the information display panel of this invention, and its manufacturing method. (A)-(e) is a figure for demonstrating the information display panel and its manufacturing method of 2nd Example of this invention. (A), (b) is a figure for demonstrating the information display panel of this invention, and its manufacturing method. (A)-(c) is a figure for demonstrating the information display panel and its manufacturing method of 3rd Example of this invention. It is a figure which shows an example of the shape of the partition in the information display panel used as the object of this invention. It is a figure which shows the structure of the information display panel of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Substrate 3W White display medium 3B Black display medium 3Wa Chargeable white particle 3Ba Chargeable black particle 4 Bulkhead 5, 6 Electrode 11 Front substrate 12 Rear substrate 13, 14 Electrode (counter electrode)
15 Driving IC
16 Flexible wiring board 17 Moisture-proof film (moisture-proof film)
18 Connection terminal 19 Drive circuit board (flexible board)
21-1 First cell 21-2 Second cell 21-3 Third cell 22R Red color filter 22G Green color filter 22B Blue color filter

Claims (7)

An information display panel that displays information such as an image by filling a display medium between two substrates with electrodes transparent at least one and electrically driving the display medium,
In an information display panel configured to electrically connect an electrode of a panel unit in which two substrates with electrodes are bonded to each other and a conductive wiring on another substrate on which a driving IC is mounted,
At least both the connection terminal portion that electrically connects the electrode on the panel substrate and the conductive wiring on another substrate on which the driving IC is mounted and the entire panel are laminated with a moisture-proof film. An information display panel characterized by An information display panel that displays information such as an image by filling a display medium between two substrates with electrodes transparent at least one and electrically driving the display medium,
In an information display panel configured to electrically connect an electrode of a panel unit in which two substrates with electrodes are bonded to each other and a conductive wiring on another substrate on which a driving IC is mounted,
Another substrate on which the driving IC is mounted is a flexible substrate, and the electrode on the panel substrate and the driving IC on the flexible substrate are electrically connected via a connection terminal portion provided on the panel substrate. After the connection, the flexible substrate is folded and arranged on the back side of the panel portion, and then the entire panel composed of the panel portion and the flexible substrate is laminated with a moisture-proof film. Panel. An information display panel that displays information such as an image by filling a display medium between two substrates with electrodes transparent at least one and electrically driving the display medium,
Information on a configuration for electrically connecting a connection terminal portion extending from a driving IC connected to an electrode of a panel having two substrates with electrodes attached to each other and another substrate on which a driving circuit is mounted. In the display panel,
The connection terminal portion extending from the driving IC connected to the electrode of the panel portion, and the entire panel portion including the connection terminal portion electrically connected to another substrate on which the drive circuit is mounted has moisture resistance. An information display panel characterized by being laminated with a film having the same. An information display panel that displays information such as an image by filling a display medium between two substrates with electrodes transparent at least one and electrically driving the display medium,
Information on a configuration for electrically connecting a connection terminal portion extending from a driving IC connected to an electrode of a panel having two substrates with electrodes attached to each other and another substrate on which a driving circuit is mounted. In the display panel,
Another substrate on which the drive circuit is mounted is a flexible substrate, and the connection terminal on the panel substrate and the conductive wiring on the flexible substrate are electrically connected via the connection terminal portion provided on the panel substrate. After the flexible substrate is bent and arranged on the back side of the panel portion, the entire panel composed of the panel portion and the flexible substrate is laminated with a moisture-proof film. panel.   The information display panel according to claim 1, wherein the moisture-proof film is a moisture-proof laminate film subjected to an antireflection treatment.   6. The display medium is a group of particles containing chargeable particles, and is driven by an electric field applied from a counter electrode formed by electrodes of two substrates. The information display panel according to any one of the above.   The information display panel according to any one of claims 1 to 6, wherein the space between the substrates filled with the display medium is a plurality of cells partitioned by partition walls.

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