JPH0320722A - Electrochromic sheet - Google Patents

Abstract

PURPOSE:To obtain a sheet which is miniature and can be easily used in arbitrary places by disposing a sheet-like transparent electrode and a sheet-like counter electrode to face each other, laminating a color developing layer and an electrolyte layer therebetween and forming an adhesive layer on one of the outside surfaces. CONSTITUTION:A glass substrate on which tin oxide and indium oxide are vapor-deposited is formed as the sheet-like transparent electrode and the color developing layer consisting of the tungsten oxide is vapor-deposited thereon. A polyethylene terephthalate film on which the tin oxide and the indium oxide are vapor-deposited is formed as the sheet-like counter electrode and the high- polymer electrolyte layer is provided between the electrodes to produce the electrochromic (EC) sheet. An ethyl acetate soln. of an acrylic pressure sensitive adhesive is applied on the film and is rolled by which the adhesive layer is formed. The EC sheet produced in such a manner is miniature and is easily usable in arbitrary places in arbitrary applications.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to electrochromics.

(Prior art) In recent years, electrochromic (hereinafter abbreviated as EC) devices have attracted attention as a new display device to replace liquid crystal display devices, and devices using EC materials such as tungsten oxide, Prussian blue, and polyaniline have been developed. ing. (
(For example, Japanese Unexamined Patent Publication No. 11861-12784, Japanese Unexamined Patent Publication No. 61-238028, etc.) Conventionally developed EC devices are generally 1ζ large, such as light control window glass and stock display boards, and are mounted on fixed stands. Many of them are attached, and their usage is limited.

Furthermore, the size and shape of such an EC device are already determined at the stage of laminating the EC materials, and it is almost impossible to change them later.

(Problems to be Solved by the Invention) In view of the above drawbacks, an object of the present invention is to provide an EC sheet that is small in size and can be easily used in any place and for any purpose.

(Means for Solving the Problems) In the present invention lζ, a sheet-like transparent IIEsil and a sheet-like counter electrode are opposed, and a coloring layer and an electrolyte layer are laminated therebetween.

Since the sheet electrode is used as an EC sheet, at least one of the sheet electrodes must be transparent. When used as a transmission type material, a sheet-like transparent electrode is also used for the counter electrode, and when used as a reflection type material, the counter electrode is preferably opaque or a sheet-like electrode having a reflective function. As such a sheet-like electrode, a material obtained by dispersing a metal or an inorganic substance in S resin and then molding it into a sheet-like material, or a material obtained by applying a conductive paint to the surface of a sheet-like base material can be used.

More preferably, a sheet-like electrode is used in which a conductive substance such as tin oxide or indium oxide is laminated on the surface of a sheet-like material using a method such as sputtering or vapor deposition. Further, a protective film may be provided on the surface of the counter electrode to prevent deterioration of the electrode, if necessary.

Preferred sheet-like base materials include materials with excellent transparency, heat resistance, weather resistance, or strength, such as glass, polyethylene terephthalate, polycarbonate, etc., but are not particularly limited. When a flexible film is used as the base material, the EC sheet itself can be rolled or bent, so it can be applied to curved surfaces.

The coloring layer used in the present invention can be made of any material whose light absorption characteristics change with the application of voltage or current. Examples include transition metal oxides such as tungsten oxide or complexes such as Prussian blue. Sara(
When a material that is soluble in a solvent and can be easily removed from the electrode is used as the coloring layer, there are the following advantages.

In other words, when the EC sheet is cut into a free shape,
Although it is necessary to expose the W+ electrode surface from the cut portion, such an operation is difficult in the case of a mw electrode with a vapor deposited film of tungsten oxide or the like as shown in, for example, Japanese Unexamined Patent Publication No. 56-130724. However, JP-A No. 63-9261
When a solvent-soluble coloring layer such as the O-(}realkylsilyl)phenylacetylene polymer shown in Publication No. 9 is used, it is easy! Only the extreme surface can be exposed, so when used in an EC sheet, it can be cut into any shape and size.

The electrolyte layer used in the present invention is preferably a solid layer, but may also be a gel-like material impregnated with a solvent. For example, in the case of a solid material, an inorganic dielectric thin film such as tantalum oxide, dioptic oxide, titanium oxide, etc. is used. On the other hand, polymer electrolytes are also suitably used, such as lithium perchlorate,
Examples include thin films prepared by dissolving and dispersing materials such as tetraethylammonium borofluoride and lithium iodide in resin components such as electromagnetic polyvinyl alcohol, polyvinyl butyral, and polyethylene oxide, followed by drying.

Any adhesive can be used for the adhesive layer used in the present invention, and although it is not particularly limited, materials with excellent transparency, heat resistance, and adhesive properties are preferable, such as acrylic pressure-sensitive adhesives, silicone-based adhesives, etc. Examples include pressure-sensitive adhesives and urethane-based pressure-sensitive adhesives.

The adhesive layer is a sheet-like transparent electrode or a sheet-like opposing W
It is provided on at least one side of the L pole, and can be used by being attached to or sandwiched between 6 windows, walls, etc. It is preferable that the adhesive surface of the adhesive layer to the substrate is protected with a release film or the like, and the release film is peeled off before use.

The EC sheet of the present invention can be cut to any size, and when using synthetic resin as the base material for electrodes, it can be used by adhering it to any curved surface as long as there are no extreme irregularities. You can also.

(Example) Next, examples of the present invention will be described.

Example 1 A glass substrate on which tin oxide and indium oxide were vapor-deposited was made into a transparent sheet. 18ii, and tungsten oxide was deposited thereon as a C coloring layer. A polyethylene terephthalate film on which tin oxide and indium oxide were vapor-deposited was used as a sorted counter electrode, and a solid electrolyte layer between the two electrodes was prepared by dissolving 1 NO of lithium perchlorate and 10 Y of cyanoethylpoval in 40 ME of acetonitrile. After sandwiching, acetonitrile was dried to produce an EC sheet.

Next, an ethyl acetate solution of the acrylic pressure-sensitive adhesive is applied to the release film to a thickness of 40 μm, and after drying, the adhesive layer is laminated on the outside of the EC sheet using a roll. The provided EC sheet was produced.

The release paper of the obtained stick-on EC sheet was removed, and the sheet was stuck on a white wall. Adhere the lead wire to the end of the electrode using silver paste, and leave a gap of ±3. When a voltage of Ov was applied, repeated discoloration between blue and white on the back surface was observed.

Example 2 A polyethylene terephthalate film on which tin oxide and indium oxide were vapor-deposited was used as a sheet-like transparent electrode and a sheet-like counter electrode, and poly(0-trimethylsilylphenylacetylene) was cast as a coloring layer on the sheet-like transparent electrode. , 1y of lithium perchlorate and 1of of cyanoethylpoval were used as a solid electrolyte layer.
After sandwiching the solution dissolved in 0-acetonitrile, the acetonitrile was dried to form an EC sheet.

Next, an ethyl acetate solution of an acrylic pressure-sensitive adhesive was applied to the top of the release film and dried, and then the adhesive layer was rolled onto the outside of the EC sheet to produce an EC sheet with an adhesive layer. .

The release paper of the obtained adhesive-type EC sheet was removed, and the adhesive-type EC sheet was adhered to a window glass. Adhere the lead wire to the end of the electrode using silver paste, and leave a gap of ±6. When a voltage of Ov was applied, repeated discoloration of reddish-purple and colorless was observed.

(Effects of the Invention) The structure of the EC sheet of the present invention is as described above, and since it is thin, the range of use of an EC device, which has conventionally been limited in use, can be greatly expanded.

In other words, it can be used by simply pasting it on a place where conventional EC devices require replacement of the window glass or a fixed stand, and moreover, it can be easily peeled off and replaced or reused when it is no longer needed. It is also possible to create a composite color by laminating and adhering another EC sort on the back side of the transmissive display part. Furthermore, if a flexible base sheet is used as the electrode, it can be used even on curved surfaces.

Claims (1)

[Claims] 1. A coloring layer and an electrolyte layer are laminated between the opposing sheet-shaped transparent electrode and sheet-shaped counter electrode, and an adhesive layer is laminated on the outer surface of at least one of the sheet-shaped transparent electrode or the sheet-shaped counter electrode. An electrochromic sheet characterized by: