JPS6332169B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an electrochromic display device (hereinafter referred to as
(abbreviated as ECD) containers. ECD takes advantage of the fact that the color tone of the substance in the display area differs when oxidized and reduced, and the color tone of the display electrode is changed by using the display substance as one electrode and applying a voltage between it and the opposite electrode. It changes electrochemically and reversibly. Figure 1 shows the general structure of an ECD. A substance 3 exhibiting electrochromism as a display electrode and a transparent electrode 2 are formed on a glass substrate 1 by vapor deposition or the like, a counter electrode with a counter electrode reactant 4 fixed on a current collector 5, and these two electrodes 2, 4 are placed opposite each other with a spacer 9 interposed therebetween, and an electrolytic solution 8 is filled between them.
A glass plate 6 is attached partially in contact with the spacer 9 or via the current collector 5 . In some cases, a porous plate-like body 7 is inserted between the two electrodes to make the change in color tone of the display electrodes clear. By these
ECD is configured. The present invention conventionally consists of a spacer and a glass plate.
This concerns ECD containers. Conventionally, containers have been made of glass, ceramics, plastics, etc. The purpose of this container is to hold the electrolyte contained therein, block oxygen, etc. from entering from the outside, and also withstand external shocks and pressure caused by contraction and expansion of the electrolyte due to temperature changes.
In addition, it must not be corroded by the electrolyte. Glass and ceramics have corrosion resistance against electrolytes,
Although it has excellent permeability to liquids or gases,
It is inferior in mechanical strength. Plastics have excellent corrosion resistance and impact resistance against electrolytes, but they are gas permeable and cannot withstand long-term use. Metal containers have excellent gas permeability and impact resistance, but have problems with corrosion resistance. In order to solve these problems, the present invention provides an ECD having an inexpensive container that improves the corrosion resistance of the metal and satisfies the above requirements for the container. The present invention will be explained below using examples and drawings. A dish-shaped container as shown at 14 in FIG. 2 is made of metal aluminum. The edge part is 3mm thick and the bottom part is 0.2mm thick. This aluminum container 14
was anodized in a 20% sulfuric acid bath at a voltage of 10 V and a current of 1.2 A/dm ² to form an alumite film with a thickness of 20 μm. After thorough washing with water, 0.5 W/dm of triethanolamine was applied at 95°C.
Boehmite treatment is carried out in an aqueous solution with a concentration of V%. Using this alumite-boehmite-treated container, an ECD was constructed as shown in Figure 2, and a temperature cycle test was carried out (-10℃ for 3 hours, +25℃ for 2 hours, +70℃ for 3 hours).
time, +25°C 2 hours - cycle repeated 1000 times)
The results are shown in Table 1. Voltage ±1V for 1sec
The life of the display electrode was investigated by repeatedly coloring and decolorizing the display electrode by applying voltage between the display electrode and the counter electrode, and the number of cycles at which the amount of electricity flowing was 50% of the initial value and the result of the discoloration of the display electrode at that time were also determined. They are also shown in Table 1.

[Table] Temperature cycle test...○: No electrolyte leakage △: Leakage confirmed by vacuum suction Discoloration of the display electrode 〇 indicates the same as the initial value, △ indicates slight discoloration,
× indicates discoloration. By using a metal container that has been surface-treated according to the present invention as in the above example, changes in the volume of the electrolyte caused by temperature changes can be absorbed by deformation of the bottom of the metal container. Corrosion caused by the electrolyte is prevented by the surface treatment layer, and a container with almost no gas permeability and excellent impact resistance can be obtained. By using the container according to the present invention in a display device, a display device with a long life can be constructed.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a conventional ECD, and FIG. 2 is a schematic block diagram showing an embodiment of the present invention. 1...Display electrode glass substrate, 2...Transparent electrode, 3
...Display electrode material, 4...Counter electrode material, 5...
Current collector, 6... Glass plate, 7... Porous plate, 8...
... Electrolyte solution, 9 ... Spacer, 10 ... Display electrode lead, 11 ... Counter electrode lead, 12 ... Electrolyte injection hole, 14 ... Metal container, 15 ... Counter electrode lead extraction hole.

Claims (1)

[Claims] 1. A display electrode formed on a transparent substrate, a counter electrode corresponding to the display electrode, an electrolytic solution filling a space between the display electrode and the counter electrode, and a display electrode corresponding to the display electrode. A display device comprising a container that houses the counter electrode and the electrolyte, the container being made of metal whose surface has been made passivated. 2. The display device according to claim 1, wherein the passivated metal is aluminum whose surface has been anodized. 3. The display device according to claim 1, wherein the passivated metal is iron whose surface is coated with a black oxide film. 4. The display device according to claim 1, wherein the passivated metal is iron whose surface has been subjected to chromate treatment.