JP2009222759A - Method of manufacturing information display panel - Google Patents

Method of manufacturing information display panel Download PDF

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Publication number
JP2009222759A
JP2009222759A JP2008064185A JP2008064185A JP2009222759A JP 2009222759 A JP2009222759 A JP 2009222759A JP 2008064185 A JP2008064185 A JP 2008064185A JP 2008064185 A JP2008064185 A JP 2008064185A JP 2009222759 A JP2009222759 A JP 2009222759A
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Japan
Prior art keywords
display panel
information display
conductive particles
substrate
information
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JP2008064185A
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Japanese (ja)
Inventor
Yoshitomo Masuda
Masayuki Nishii
Makoto Sakurai
善友 増田
良 桜井
雅之 西井
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Bridgestone Corp
株式会社ブリヂストン
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Priority to JP2008064185A priority Critical patent/JP2009222759A/en
Publication of JP2009222759A publication Critical patent/JP2009222759A/en
Application status is Withdrawn legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing an information display panel, using particles whose average particle diameter is about twice as large as the gap between panel substrates as conductive particles of an anisotropic conductive sealing agent (ACS), and fully securing electric connection, even in a display panel that uses a film substrate. <P>SOLUTION: According to this method of manufacturing the information display panel, in electrically connecting an electrode provided on one substrate and an electrode provided on the other substrate, by using the anisotropic conductive sealing agent made of a paste-like adhesive, in which conductive particles are dispersed, and uses an easily deformable material whose storage elastic modulus is in the range of 1×10<SP>4</SP>Pa to 1×10<SP>9</SP>Pa as the base material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method of manufacturing an information display panel, and in particular, an information display for displaying information such as an image by enclosing a display medium between two substrates, at least one of which is transparent, and electrically driving the display medium. The present invention relates to a method for manufacturing a panel.

  Conventionally, in an information display panel, it is necessary to electrically connect an electrode provided on one substrate and an electrode provided on the other substrate. In this case, from an adhesive paste in which conductive particles are dispersed. A technique of connecting with an anisotropic conductive sealant (ACS) is known (for example, see Patent Document 1).

  7A to 7D and 8A to 8D are views showing an example of a conventional method for manufacturing an information display panel. First, as shown in FIG. 7A and FIG. 8A, electrodes B1 to B4 for supplying power to the pixel units forming each information display section and electrodes (F1) formed on the other substrate ~ F4) and a back substrate 51 provided with electrodes A1 to A4 for connection are prepared, and as shown in FIGS. 7B and 8B, for each pixel forming each information display unit A transparent front substrate 52 provided with transparent electrodes F1 to F4 for supplying power is prepared. Next, as shown in FIGS. 7C and 8C, an anisotropic conductive sealant 53 made of an adhesive sealant containing conductive particles is formed outside the information display portion on the back substrate 51. Is provided. Finally, as shown in FIGS. 7D and 8D, the front substrate 52 is overlaid on the back substrate 51 via the sealant 53, and the electrodes F1 to F4 of the front substrate 52 are placed on the back substrate 51. Are electrically extracted from the electrodes A1 to A4. By using the anisotropic conductive sealant 53, the electrodes A1 to A4 marked with ○ and the electrodes F1 to F4 of the front substrate 52 are contacted by the conductive particles in the sealant 53, and only the portions are conductive. It has sex. Reference numeral 54 denotes an information display unit.

JP 2007-41452 A

In the conventional information display panel manufacturing method described above, when electrical connection is performed using an anisotropic conductive sealant (ACS), the conventional ACS has the following problems.
(1) The average particle size of the conductive particles must be suppressed to 1.0 to 1.1 times the gap between the panel substrates, and precise particle size control is required. If conductive particles exceeding 1.1 times the gap between panel substrates were used, troubles such as peeling of the substrate occurred due to elastic repulsion of the conductive particles.
(2) When a flexible film or the like is used for the substrate, there is a problem in that the conductive particles cannot be crushed because the film substrate cannot be crushed. This is probably because the elastic modulus of the conductive particles is higher than that of the film substrate.

  An object of the present invention is to solve the above-mentioned problems, and can use conductive particles having an average particle size of up to about twice the gap between panel substrates as conductive particles for ACS. A display panel using a film substrate However, an object of the present invention is to provide a method for manufacturing an information display panel capable of sufficiently ensuring electrical connection between panel substrate electrodes.

The information display panel manufacturing method of the present invention is the information display panel manufacturing method, wherein the electrode provided on one substrate and the electrode provided on the other substrate are made of a paste adhesive in which conductive particles are dispersed. A material having a storage elastic modulus in the range of 1 × 10 4 Pa to 1 × 10 9 Pa and easily deformed when electrically connected by the anisotropic conductive sealant made of It is characterized by using.

  As a preferred example of the method for manufacturing the information display panel of the present invention, the information display panel encloses a display medium between two substrates, at least one of which is transparent, and the display medium is electrically driven to generate an image or the like. An information display panel for displaying the information, and the information display panel encapsulates a display medium configured as a particle group including a chargeable particle between two substrates, at least one of which is transparent. It is an information display panel that displays information such as images by moving the display medium by applying an electric field, and the information display panel is between two flexible substrates at least one of which is transparent. An information display panel for enclosing a display medium and electrically driving the display medium to display information such as an image, and conductive particles and an adhesive paste constituting an anisotropic conductive sealant (ACS) Mixed with There a weight ratio of 1: 100 to 30: in the range of 100, there are.

According to the present invention, the base material of the conductive particles constituting the anisotropic conductive sealant (ACS) has a storage elastic modulus in the range of 1 × 10 4 Pa to 1 × 10 9 Pa and can be easily deformed. As a specific example of using a material, conductive particles for ACS can be obtained by forming conductive particles such as polyethylene or rubber elastomer having a storage elastic modulus in the above-described range by metal coating by a method such as plating. Display that can be used as conductive particles as conductive particles having an average particle size of up to about twice the gap between panel substrates, and even in a display panel using a film substrate, sufficient electrical connection between panel substrate electrodes can be secured. A panel manufacturing method can be obtained.

  First, as an example of an information display panel that is an object of the manufacturing method of the present invention, a basic configuration of an information display panel of a system that drives a particle group including a chargeable particle as a display medium will be described. In the information display panel, an electric field is applied to a display medium sealed between two opposing substrates. Along with the applied electric field direction, the display medium is attracted by an electric field force or a Coulomb force, and the display medium is moved by a change in the electric field direction, whereby information such as an image is displayed. Therefore, it is necessary to design the information display panel so that the display medium can move uniformly and maintain the stability when the display information is rewritten or when the 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 the information display panel which is a target of the manufacturing method of the present invention will be described with reference to FIGS. 1 (a) and 1 (b) to FIG.

  In the example shown in FIGS. 1 (a) and (b), at least two or more kinds of particles having at least two optical reflectivities and different charge characteristics are formed as a particle group including particles having optical reflectivity and chargeability. A display medium (here, a white display medium 3W composed of a particle group including a chargeable white particle 3Wa and a black display medium 3B composed of a particle group including a chargeable black particle 3Ba) is shown. In the cell, depending on the electric field generated by applying a voltage between the electrode 5 (individual electrode) provided on the substrate 1 and the electrode 6 (individual electrode) provided on the substrate 2, the cell 1 is perpendicular to the substrates 1 and 2. Move. Then, as shown in FIG. 1A, the white display medium 3W is visually recognized by the observer and white dot display is performed, or as shown in FIG. 1B, the black display medium 3B is visually recognized by the observer. Black dots are displayed. In addition, in FIG. 1 (a), (b), the partition in front is abbreviate | omitted.

  In the example shown in FIGS. 2 (a) and 2 (b), at least two or more types having different optical reflectivity and charging characteristics are configured as a particle group including particles having at least optical reflectivity and chargeability. A display medium (here, a white display medium 3W composed of a particle group including a chargeable white particle 3Wa and a black display medium 3B composed of a particle group including a chargeable black particle 3Ba) is shown. In the cell, perpendicular to the substrates 1 and 2 depending on the electric field generated by applying a voltage between the electrode 5 (line electrode) provided on the substrate 1 and the electrode 6 (line electrode) provided on the substrate 2. Move. 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.

  In the example shown in FIGS. 3A and 3B, at least one type of display medium (here, the charged white particles 3Wa are included) configured as a particle group including particles having at least optical reflectance and chargeability. A white display medium 3W composed of particles) is generated by applying a voltage between the electrode 6 provided on the substrate 1 and the electrode 5 provided on the substrate 2 in each cell formed by the partition walls 4. The substrate is moved in a direction substantially perpendicular to the substrates 1 and 2 according to the electric field. Then, as shown in FIG. 3 (a), the white display medium 3W is visually recognized by the observer to display white dots, or as shown in FIG. 3 (b), the color of the black plate 7 is changed to the observer. The black dots are displayed by visually recognizing. In addition, in the example shown to Fig.3 (a), (b), the partition in front is abbreviate | omitted.

  In the example shown in FIGS. 4A and 4B, an example of color display in which a display unit is configured by three cells is shown. In the example shown in FIGS. 4A and 4B, all the cells 21-1 to 21-3 as the display medium are filled with the white display medium 3W and the black display medium 3B, and the first cell 21-1. A red color filter 22R is provided on the viewer side, a green color filter 22G is provided on the viewer side of the second cell 21-2, a blue color filter 22BL is provided on the viewer side of the third cell 21-3, A display unit is composed of three cells, the first cell 21-1, the second cell 21-2, and the third cell 21-3. In this example, as shown in FIG. 4A, the white display medium 3 </ b> W is moved in the first cell 21-1 to the third cell 21-3 on the viewer side, so that By performing white dot display or by moving the black display medium 3B in all the first cells 21-1 to 21-3 to the viewer side as shown in FIG. 4B. Black dots are displayed to the observer. In addition, in FIG. 4 (a), (b), the partition in front is abbreviate | omitted. Multicolor display can be performed by moving the display medium of each cell.

  In the example shown in FIGS. 5 and 6, another example in which black and white display is performed using the line electrodes 5 and 6 is described as in the example shown in FIGS. In the example shown in FIG. 5, the white display medium 3W and the black display medium are used instead of the cells formed by the partition walls 4 filled with the white display medium 3W and the black display medium 3B shown in FIGS. A microcapsule 9 filled with 3B together with the insulating liquid 8 is used. Moreover, in the example shown in FIG. 6, instead of the cell formed of the partition wall 4 filled with the white display medium 3W and the black display medium 3B shown in FIGS. In addition, a microcapsule 9 in which a rotating ball 10 having opposite polarities in the black part and the white part is filled together with the insulating liquid 8 as a display medium is used. In any of the examples shown in FIGS. 6 and 7, monochrome dot display can be performed as in the example shown in FIG.

A feature of the method for manufacturing an information display panel of the present invention is that, for example, in the above-described method for manufacturing an information display panel, conductive particles are dispersed in an electrode provided on one substrate and an electrode provided on the other substrate. The storage elastic modulus (E ′) of the base material of the conductive particles is 1 × 10 4 Pa to 1 × 10 4 when electrically connected by the anisotropic conductive sealant (ACS) made of the paste adhesive. The material is in the range of 9 Pa and easily deformed. Here, the reason why the storage elastic modulus of the base material of the conductive particles is limited to 1 × 10 4 Pa to 1 × 10 9 Pa is to specify a material that can be easily deformed, and the storage elastic modulus is 1 × 10 6. If it is less than 4 Pa, the shape of the conductive particles cannot be maintained, and if the storage elastic modulus exceeds 1 × 10 9 Pa, conductive particles having an average particle diameter exceeding 1.1 times the gap between panel substrates are used. This is because problems such as peeling of the substrate due to repulsion of the conductive particles occur. Further, the storage elastic modulus of the base material of the conductive particles is more preferably in the range of 1 × 10 5 Pa to 1 × 10 8 Pa.

  In the present invention, the structure of the conductive particles constituting the anisotropic conductive sealant (ACS) is not limited as long as the base material is made of an easily deformable material in the above-described range and has conductivity. Although conductive particles having various configurations can be used, it is preferable to use conductive particles having a configuration in which the surfaces of the particles made of the base material described above are covered with metal. As a method of coating the surface of particles with metal, there are techniques such as plating, vapor deposition, sputtering, and coating. In this case, the thickness of the metal coating is desirably 5% or less of the particle diameter. The material of the base material is not particularly limited as long as it satisfies the range of the storage elastic modulus described above, and any material can be used. Specifically, it is preferable to use an elastic body such as polyethylene or rubber elastomer. . The production method of the base material particles, the production method of the conductive particles, and the metal coating method are not particularly limited, and conventionally known methods can be used.

  Regarding the conductive particles and adhesive constituting the anisotropic conductive sealant (ACS), there is no particular limitation on the properties of the adhesive blended with the conductive particles, but the adhesive itself is insulative, In order to fix the deformation of the conductive particles generated during electrical connection, it is necessary that the elastic modulus after curing of the conductive particles is higher than the storage elastic modulus of the conductive particles. Moreover, there is no restriction | limiting in particular about the compounding ratio of electroconductive particle and an adhesive agent, However, The range of electroconductive particle: adhesive = 1: 100-30: 100 is preferable by weight ratio, and 5: 100-20 by weight ratio. : 100 is more preferable. When the amount of the conductive particles is less than 1: 100 by weight, the conductive particles may not be present in the ACS connection portion (for example, a circled portion in FIG. 7C described later), and the weight ratio is 30. When the ratio exceeds 100, the conductive particles are difficult to disperse in the binder, and the aggregate of the conductive particles may cause leakage.

  Hereinafter, an actual example will be described.

As shown in Table 1 below, conductive resin particles whose surface is coated with nickel (Ni) and gold (Au) and coated with the surface of the resin base particles, and an adhesive composition mainly composed of a one-part epoxy resin An anisotropic conductive sealant (ACS) mixed with a product was prepared. Moreover, in order to evaluate the quality of electrical connectivity, two types of display panels according to Examples 1 to 5 and Comparative Examples 1 to 3 each having the structure shown in FIG. 7 were produced.
・ Glass panel with two glass substrates bonded together: Gap between panel substrates (40 μm)
-Film panel with two polyethylene terephthalate (PET) film substrates bonded together: Gap between panel substrates (40 μm)

  A display test was performed on the manufactured display panel, and it was examined whether or not the ACS portion was electrically connected by observing whether there was a conduction failure. In addition, it was also confirmed whether there was any defect in the bonding performed between the top of the partition wall and the substrate. The results are shown in Table 1 below.

  From the results in Table 1, the following was found.

The ACSs of Examples 1 to 5 using polyethylene, polybutadiene, polyisoprene, and polyacryl, which are resin materials having a storage elastic modulus in the range of 1 × 10 4 Pa to 1 × 10 9 Pa as the base material of the conductive particles. In the display panel manufactured by applying, the average particle diameter of the conductive particles included in the ACS is in an appropriate range with respect to the gap between the panel substrates (40 μm), and good display can be performed. In Example 2, conductive particles having a size nearly twice as large as the gap between panel substrates (40 μm) (the base material is polyethylene particles) are used. However, as in Example 1, display can be performed without problems. did it. In Examples 3 and 4, when polybutadiene and polyisoprene, which are synthetic rubbers, were used as the base material of the conductive particles, the display could be performed without problems as in Example 1. In Example 5, when polyacryl having an elastic modulus of 1 × 10 9 Pa was used, display could be performed without any problem as in Example 1.

On the other hand, as in Comparative Examples 1 and 2, when a cross-linked polystyrene having a storage elastic modulus exceeding 1 × 10 9 Pa is used as a base material of conductive particles (a material generally used for ACS such as a liquid crystal panel). ) When the average particle diameter is equal to the panel substrate gap, the glass panel can be displayed without conduction failure. However, in the film panel, even if the average gap diameter (41 μm) of the conductive particles is aligned with respect to the gap between the panel substrates (40 μm), good display cannot be performed, and conduction failures frequently occur. When the average particle diameter of the conductive particles having a storage elastic modulus of the material larger than 1 × 10 9 Pa is made larger than the gap between the panel substrates, in the glass panel, a part of the adhesive surface between the top of the partition wall and the substrate is seen to be peeled off. This is considered to be due to the elastic repulsion of the conductive particles.In Comparative Examples 1, 2, and 3, the glass panel was able to display, but the film panel had a conduction failure, resulting in good display. Could not do.

  Information display panels subject to the manufacturing method of 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 paper such as electronic newspapers, signboards, posters, bulletin boards such as blackboards (whiteboards), display units for electronic desk calculators, home appliances, automobile supplies, card display units such as point cards and IC cards, electronic advertisements, information boards In addition to electronic POP (Point Of Presence, Point Of Purchase advertising), electronic price tag, electronic shelf label, electronic score, display part of RF-ID equipment, display part of various electronic equipment such as POS terminal, car navigation device, clock, etc. In addition, it is also suitable for use as a display unit (rewritable paper) for rewriting display by connecting to external rewriting means. The

  As for the display medium method used for the information display panel that is the object of the manufacturing method of the present invention, in addition to the charged particle movement method described so far, the conductive particle movement method, liquid crystal method, electrochromic method, electrophoresis method, etc. Various types of display media can be used. As for the driving method of the information display panel that is the object of the manufacturing method of the present invention, 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 element represented by a thin film transistor (TFT) Alternatively, the present invention can be applied to an active matrix driving method using a two-terminal switching element typified by a thin film diode (TFD) and various types of driving information display panels.

(A), (b) is a figure which shows an example of the information display panel used as the object of the manufacturing method of this invention, respectively. (A), (b) is a figure which shows the other example of the information display panel used as the object of the manufacturing method of this invention, respectively. (A), (b) is a figure which shows the further another example of the information display panel used as the object of the manufacturing method of this invention, respectively. (A), (b) is a figure which shows the further another example of the information display panel used as the object of the manufacturing method of this invention, respectively. It is a figure which shows the further another example of the information display panel used as the object of the manufacturing method of this invention. It is a figure which shows the further another example of the information display panel used as the object of the manufacturing method of this invention. (A)-(d) is a figure for demonstrating an example of the method of superimposing a board | substrate in the manufacturing method of the information display panel, respectively. (A)-(d) is a figure for demonstrating the other example of the method of overlapping a board | substrate in the manufacturing method of the information display panel, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Substrate 3W White display medium 3Wa Chargeable white particle 3B Black display medium 3Ba Chargeable black particle 4 Partition 5, 6 Electrode 7 Black plate 8 Insulating liquid 9 Microcapsule 10 Rotating ball 21-1 1st cell 21-2 Second cell 21-3 Third cell 22R Red color filter 22G Green color filter 22BL Blue color filter

Claims (5)

  1. In the method for manufacturing an information display panel, an electrode provided on one substrate and an electrode provided on the other substrate are electrically connected by an anisotropic conductive sealant made of a paste adhesive in which conductive particles are dispersed. A method for manufacturing an information display panel, wherein a material having a storage elastic modulus in a range of 1 × 10 4 Pa to 1 × 10 9 Pa is used as a base material for conductive particles.
  2.   The information display panel is an information display panel for displaying information such as an image by enclosing a display medium between two substrates, at least one of which is transparent, and electrically driving the display medium. The manufacturing method of the information display panel of Claim 1.
  3.   An information display panel encloses a display medium configured as a particle group including a chargeable particle between two substrates, at least one of which is transparent, and moves the display medium by applying an electric field to the display medium. 2. The information display panel manufacturing method according to claim 1, wherein the information display panel displays information such as an image.
  4.   The information display panel is an information display panel in which a display medium is sealed between two flexible substrates, at least one of which is transparent, and the display medium is electrically driven to display information such as an image. The method for manufacturing an information display panel according to claim 1.
  5.   The mixing ratio of the conductive particles constituting the anisotropic conductive sealant and the paste-like adhesive is in the range of 1: 100 to 30: 100 by weight ratio. The manufacturing method of the information display panel as described in claim | item.
JP2008064185A 2008-03-13 2008-03-13 Method of manufacturing information display panel Withdrawn JP2009222759A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8797634B2 (en) 2010-11-30 2014-08-05 E Ink Corporation Multi-color electrophoretic displays

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8797634B2 (en) 2010-11-30 2014-08-05 E Ink Corporation Multi-color electrophoretic displays

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