JPS59216178A - Manufacture of electrochromic display element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an electrochromic display element, particularly a method for fixing a counter electrode in the form of a conductive sheet prepared by mixing redox material powder and deforming it under pressure to a substrate; The present invention relates to a method for creating this counter electrode lead portion.

Generally, electrochromic display elements (Electr
.

Chromic Device; hereinafter abbreviated as ECD. ) as shown in the figure. FIG. 1 is a sectional view showing the configuration of a conventional ECD. In the figure, (1a) is a display substrate, (1b) is a counter substrate, (1a) is a display substrate, (1b) is a counter substrate, (
2) is a display electrode, (3) is an electrochromic material,
(4) is a counter electrode, (6) is a white background plate, (6) is a spacer, (7) is an electrolyte solution, and (ioo) is an ECD main body, which covers the entire display cell. In the display element having such a configuration, when a voltage is applied, the color of the EC substance (3) changes reversibly as a result of an oxidation-reduction reaction at the electrode portions (2+, (41), and a display is performed.

The counter electrode (4)K in this stiff ECD is required to have the following characteristics. (2) Corresponding to the redox reaction of the electrochromic substance (3) (hereinafter abbreviated as EC substance) at the display electrode (2), a highly reversible redox reaction is carried out.

Fluctuations in O electrode potential are small. O Overvoltage is small. @Lead resistance is small.

Recently, as a counter electrode (4) that satisfies these characteristics, redox material powder and conductive powder such as graphite powder are mixed.
Pressure-formed sheets are now being used. To create this conductive sheet-like counter electrode (4), it is common to insert a mesh-like metal, such as a titanium wire, into the sheet to take out the leads, and press-form it. However, when this mesh-like metal is introduced, there is a problem in that the conductive sheet molding material tends to peel off, making the molding process extremely difficult.

On the other hand, when attaching the counter electrode (4) in the form of a conductive sheet to the ECD, a white background plate (
5) or other crimping elastic body, and place the opposite substrate (
1b), but this method may not be sufficient in some cases, and since the counter electrode (4) in the form of a conductive sheet is mechanically fragile, such a fixing method has the disadvantage of being easily broken.

This invention was made to improve the above-mentioned drawbacks, and a conductive sheet is formed by providing a film-like conductive lead portion on an opposing substrate, mixing redox material powder and conductive powder, and press-forming the mixture. By bonding and molding the counter electrode onto the counter substrate using a conductive adhesive, the counter electrode in the form of a conductive sheet can be stably fixed onto the counter substrate, and the leads of the counter electrode can be stabilized. The purpose is to take it out with ease.

Further, a conductive sheet formed by mixing a redox material powder and a conductive powder and press-forming the mixture is adhered to the above-mentioned counter substrate using a conductive adhesive to form a counter electrode. A similar objective is also attempted by forming a counter electrode lead.

An embodiment of the present invention will be explained below. Second
The figure is a sectional view showing one embodiment of an ECD manufactured according to the present invention. Ill is a conductive adhesive, i4'4 is a conductive sheet, and (8) is a conductive lead portion.

First, a conductive lead portion (8) having good conductivity and being electrochemically stable is provided on the counter substrate (1b) at a portion corresponding to the counter electrode (4) and at a lead extraction portion. For example, gold conductive lead portions (8) are formed by vapor deposition of gold or by applying and firing a gold paste. A conductive adhesive (4) that is electrochemically stable and stable in the electrolyte was applied to the corresponding part of the counter electrode (4), and redox material powder and conductive powder were mixed and pressure molded. The conductive sheets (4 layers) are tied together and fixed. As the conductive adhesive @η used here, a carbon-based adhesive or paste is suitable.

FIG. 8 is a sectional view showing another embodiment of the ECD manufactured according to the present invention. Here, the conductive sheet (6) is attached to the counter substrate (1b) using a conductive adhesive, without particularly providing a film-like conductive lead part (8) in advance.
A counter electrode (4) was formed by adhering it thereon, and a counter electrode lead portion was also formed using this conductive adhesive 14υ. That is, on the counter substrate (1b), a conductive adhesive was applied to the conductive sheet bonding part and the lead extraction part, and the conductive sheet was fixed and the lead part was formed at the same time.

In the above embodiment, the EC material layer (3) is used as the display electrode (2).
), but it can also be applied to a type of display cell in which an EC substance and an electrolyte solution are sandwiched between both electrodes.

Hereinafter, a method for manufacturing an ECD according to the present invention will be explained in detail. On the counter board (1b), apply gold paste (+
8885-IB (manufactured by ESL) was applied by screen printing and fired at 650° C. to form a conductive lead portion (8) comprising a thin conductive layer. Furthermore, carbon paste [υ (Ephryom 101
P (manufactured by Nippon Graphite Industries Co., Ltd.) by screen printing, mixed oxidation-reduction material powder (60% by weight) such as Mn0t and conductive powder (60% by weight), and pressure-molded. The sheets (6) were bonded together and heated at 150° C. for 80 minutes to be adhesively fixed.

A solution in which a polymeric EC substance synthesized by the reaction of polystyrene sulfonic acid and polymerized trimethylene viologen is dissolved in a mixed solvent consisting of dioxane-hydrochloric acid and water, and a tin oxide-coated titanium oxide powder is mixed therein as a conductive filler. I T O (I
A film-like EC layer (3) was formed by screen printing on the display electrode (2) made of ndium Tin Oxide.

A white ceramic background plate (5) was placed inside, and the display electrode substrate (1a) and the counter electrode substrate (1b) were bonded together via a spacer (6) to produce an E CD (100).

A 0.8 mol/l potassium sulfate (K, SO,) aqueous solution was used as the electrolyte solution (7).

When a voltage of about 1 square meter was applied to the ECD thus manufactured using the display electrode (2) as a cathode, the EC substance (3) on the display electrode (2) was colored reddish-purple vc blue. Next, the display electrode (
When 2) and the counter electrode (4) were short-circuited, the original white color returned. Demonstrates stability against repeated display and is 20m5
It exhibited a high-speed response of ec (contrast ratio, 2:1).

As described above, according to the present invention, a film-like conductive lead portion is provided on the counter substrate, and a conductive sheet formed by mixing redox material powder and conductive powder and press-forming the conductive sheet is bonded to a conductive adhesive. Since the counter electrode was formed by adhering onto the counter substrate using the above-mentioned material, it is possible to form a counter electrode and a lead having a highly stable structure.

Further, a conductive sheet formed by mixing a redox material powder and a conductive powder and press-forming the mixture is adhered to the above-mentioned counter substrate using a conductive adhesive to form a counter electrode. A similar effect can also be achieved by forming a counter electrode lead.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a conventional ECD, FIG. 2 is a sectional view showing an embodiment of the ECD manufactured according to the present invention, and FIG. 8 is a sectional view showing the ECD manufactured according to the present invention. FIG. 3 is a sectional view showing another embodiment of the invention. In the figure, (la) is the display substrate, (lb) is the counter substrate, (2) is the display electrode, (3) is the EC material, (4) is the counter electrode, (6) is the spacer, and (7) is the electrolyte solution. , (8)
01) is a conductive adhesive, [■] is a dragon sheet, and (100) is an ECD main body. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1;' (Go to Figure 52 Figure 3 Commissioner of the Japan Patent Office 1, Indication of the case Tokugakusho !＞za-f 7 f 0
2. Name of the invention Method for manufacturing an electrochromic display element 3. Person making the amendment Representative Hitoshi Katayama Part 5. Detailed description of the invention of the subject matter of the amendment Column 6, "By piezoforming" in line 12 of page 2 of the detailed description of the amendment is corrected to "by piezoelectrically". that's all

Claims (2)

[Claims] (1) A display substrate having a display electrode, a counter substrate facing the display substrate and having a counter electrode on the display electrode side, a spacer interposed between the side substrates, and a space formed by the split substrate and the spacer. An electrochromink display element body is provided with an electrochromink material housed in an electrochromink material and an electrolyte solution, and a film-like conductive lead portion is provided on the counter substrate, and a redox material powder and a conductive powder are disposed on the opposite substrate. 1. A method for manufacturing an electrochromic display element, comprising adhering a mixed and pressure-molded conductive sheet onto the counter substrate using a conductive adhesive to form a counter electrode. (2) a display substrate having display electrodes, facing this substrate;
An electrochromic display comprising a counter substrate having a counter electrode on the display electrode side, a spacer interposed between the side substrates, an electrochromic substance housed in a space formed by the split substrate and the spacer, and an electrolyte solution. In the device having an element body, a conductive sheet formed by mixing a redox material powder and a conductive powder and press-molding the mixture is adhered to the counter substrate using a conductive adhesive to form a counter electrode, and A method for manufacturing an electrochromic display element, characterized in that a counter electrode lead is formed using the conductive adhesive described above.