JP2541413Y2 - Electrophoretic display - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a display device using electrophoretic particles, wherein one of the electrode plates is formed of a flexible sheet, and the flexible sheet is formed of a metal foil. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophoretic display device having a laminated film or a metal-deposited film, thereby preventing moisture from permeating a dispersion system and improving the durability of the display device.

[0002]

2. Description of the Related Art As shown in FIG. 4, this type of electrophoretic display device using electrophoretic particles has a required display electrode pattern by using an appropriate transparent conductive member such as indium tin oxide on the opposing surfaces. And two transparent glass plates 1 and 3 in which electrophoretic particles 6 are dispersed in a liquid dispersing medium. The sealing member 5 also serving as the above is disposed in the outer peripheral portion. In the electrophoretic display device having such a structure, a display driving voltage is applied to the electrode patterns 2 and 4 so that the electrophoretic particles 6 are applied.
An electric field is applied to the dispersion system 7 to change the distribution state of the electrophoretic particles 6 so that the particles can be adsorbed and desorbed from the electrode patterns 2 and 4, thereby changing the optical characteristics of the dispersion system 7 so that characters, A desired display operation of a symbol or a graphic is performed.

[0003]

In such an electrophoretic display device, when a film member is used for one of the electrode plates, the humidity of the operating environment is reduced due to the permeation of moisture such as water vapor through the film member. Since the change affects the amount of water in the dispersion, it is difficult to obtain a stable operation as a display device.

[0004]

According to the present invention, when one of the electrode plates is constituted by a flexible sheet, this flexible sheet is used.
The flexible sheet is provided with a film on which a metal foil is laminated or a film on which a metal is vapor-deposited, thereby lowering the moisture permeability of the flexible sheet and keeping the moisture in the dispersion system constant. Thus, a highly reliable display device is provided.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 10 denotes a transparent glass plate as a base material for forming a transparent rigid electrode plate, on the upper surface of which a transparent conductive material such as indium tin oxide is used. The required electrode patterns 11 are formed appropriately. On the upper surface of the rigid electrode plate, there is provided an elastic porous spacer 12 for dividing and enclosing the dispersion system into small sections. The porous spacer 12 is formed on a sheet made of a material such as synthetic rubber such as silicon rubber, urethane rubber, fluorine rubber, or acrylic rubber or a material such as natural rubber by a punch, a laser or the like. A plurality of holes are integrally formed on the rigid electrode plate on the side where the electrode pattern 11 is formed, or a photosensitive resin is formed on the electrode pattern 11 by chemicals such as etching. The required through-holes can be arbitrarily formed by means of a suitable dissolving means.

As shown in FIG. 2, the elastic porous spacer 12 has a large number of through holes 12B formed in the above-described manner for dividing and enclosing the dispersion system. The area includes a through hole 12 in connection with a flexible electrode plate described later.
It is preferable to form the adhesive fixing portion 12A indicated by oblique lines without B. On the upper surface of such an elastic porous spacer 12, there is provided a flexible electrode plate comprising a flexible sheet 13 having another electrode pattern 12 formed on the surface facing the electrode pattern 11. It is arranged.

Reference numeral 15 denotes a pressurizing member, which is a dispersion member 7 which is excessively supplied to each hole 12B of the elastic porous spacer 12.
Is pressed from the upper surface of the flexible electrode plate to compress the spacer 12 and to push out the excess dispersion system 7,
This is for completely filling the dispersion system 7 having no pores in each hole 12B of the elastic porous spacer 12. As the pressing member 15, at least one of a substrate, a liquid, and a solid can be appropriately used. In the illustrated example, a steel roll is used. Reference numeral 16 denotes an adhesive for fixing and joining the components at their ends.

FIG. 3 shows an example of the structure of a flexible sheet 13 for forming a flexible electrode plate. In FIG. 1A, polyethylene terephne is provided on both sides of a metal foil 13B such as an aluminum foil. This shows a three-layer structure in which resin films 13A and 13C such as turrets are laminated, and FIG. 2B shows, for example, a metal-deposited film such as an aluminum-deposited film on one surface of one resin film 13A. 13D, a three-layer structure is shown in which another resin film 13C is similarly laminated on the metal deposition film 13D side.

An electrophoretic display device having a flexible electrode plate using a flexible sheet 13 having the structure shown in FIGS. 3A and 3B and a flexible device having a single resin film as in the prior art. When three types of electrophoretic display devices each having a neutral electrode plate were manufactured, and these display devices were left in an atmosphere of a temperature of 60 ° C. and a humidity of 95% for 24 hours to compare their moisture permeability, FIG. intended for 1) 0.28 g / m ^2, is 0.30 g / m ² as in FIG. (2), and is of conventional 1.5 g /
and the results of m ^2.

Therefore, as compared with the conventional structure, the display device of the present invention can maintain the display performance ten times or more.

[0011]

In the electrophoretic display device according to the present invention, when one of the counter electrode plates of the display device is formed of a flexible sheet, the flexible sheet is a film in which a metal foil is laminated. Alternatively, since the flexible sheet is provided with a film on which metal is deposited, the moisture permeability of the flexible sheet is reduced, and the moisture in the dispersion system is kept constant, thereby providing a highly reliable display device. Can be.

[Brief description of the drawings]

FIG. 1 is a conceptual enlarged cross-sectional configuration diagram of a main part of an electrophoretic display device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged plan view of an elastic porous spacer used in the present invention.

FIGS. 3 (1) and (2) are conceptual enlarged cross-sectional views showing a configuration example of a flexible sheet used in the present invention.

FIG. 4 is a conceptual enlarged cross-sectional configuration diagram of a main part of a conventional electrophoretic display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Transparent glass plate 11 Electrode pattern 12 Elastic porous spacer 13 Flexible sheet 13A Resin film 13B Metal foil 13C Resin film 13D Metal deposition film 14 Electrode pattern 15 Pressure member 16 Adhesion for joining Agent

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takashi Mori 757 Tentakaki, Kusazaki-cho, Inashiki-gun, Ibaraki Pref. Nippon Mektron Co., Ltd. (72) Inventor Jiro Toyama 757 Tenhoki, Kasazaki-cho, Inashiki-gun, Ibaraki Japan Inside of Minkoku Ibaraki Plant

Claims (1)

(57) [Scope of request for utility model registration] 1. A dispersion system containing electrophoretic particles is sealed between a pair of counter electrode plates, at least one of which is transparent, and the electrophoresis in the dispersion system is controlled by a display control voltage applied between the electrode plates. In an electrophoretic display device in which the required display operation is performed by changing the optical reflection characteristic by changing the distribution state of the particles, in order to divide the dispersion system discontinuously, the distance between the electrode plates is reduced. An elastic porous spacer interposed therebetween, and one of the opposed electrode plates is formed of a flexible sheet,
An electrophoretic display device wherein the flexible sheet includes a film in which a metal foil is laminated or a film in which a metal is deposited.