JPS597347A - Manufacture of electrochromic display device - Google Patents

Abstract

PURPOSE:To perfectly seal the part to be sealed without being attached with propylene carbonate contained in an electrochromic soln., and an electrochromic display (ECD) device at low cost with high yield, by dealing the inlet of the ECD device for said soln. by soldering with a metal plate fixed in advance. CONSTITUTION:A thermosetting epoxy adhesive 16 same as that used for adhering an upper transparent substrate 1 with a lower substrate 2 is applied around the inlet 10 of the ECD device for the electrolytic soln. 6 by the screen printing on the substrate 2 in advance in order to seal said inlet 10, and a round metallic plate 17 prepd. by plating phosphor bronze with gold is adhered to said adhesive 16. After introduction of said soln. 6 a solder 18 is fused with a soldering copper or the like on the plate 17 to seal the outlet 10. Since the adhesive 16 do not almost change at the fusing point of the solder 18, the inlet 10 is perfectly sealed and a highly reliable ECD device can be obtained with high yield.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an electrochromic display device, in which the electrochromic display device is sealed by soldering using a metal plate provided in advance.

A mer1' electrochromic (hereinafter referred to as E and c) display device will be briefly explained based on FIG. Furthermore, WO, which is an electrochemical coloring substance,
, 4 are formed. 5 is a background plate that is installed for the purpose of making the blue-colored WO3゜@ appear clearly, and white is generally used. This background plate also has a porosity similar to that of filter paper or a filter in order to improve conductivity between the top and bottom. A counter electrode 7 is placed below it.

The background plate 5 and the counter electrode 7 are wrapped around the upper transparent substrate and the device substrate 2. 9 is a layering agent at that time. The electrolyte 6 is injected from the injection port 1o by the vacuum injection method.

4 and propylene carbonate are common.

The injection port is electrically sealed with the sealant No. 11. 8
This is a lead wire for leading out of the counter electrode 2.

Conventionally, such a g, c display device'f: case of final sealing (1). As shown in FIG. 2, low melting point gold 4[2 is embedded in the injection port 10, and a room temperature curing type adhesive 13 is molded thereon. [Because the electrolyte will flow out when heat is applied. ] (2). As shown in Figure 3, using a glass vessel substrate 2,
A structure in which a Cr--Au thin film 14 is formed in advance around the injection port 9 by vacuum evaporation so that a low melting point metal 15 such as solder can be welded thereto.

It was done in the same way. However, these methods have the following drawbacks.

In the case of method (1), most of the adhesives that cure at room temperature are eroded by the electrically conductive propylene carbonate liquid.

Unfortunately, the sealing life is short and the electrical characteristics of the E and C display devices are ruined. Furthermore, the propylene carbonate liquid leaks out and damages the drive circuit.

In the case of method (2), the cost is extremely high because a thin Cr-Au layer as shown in Figure 3 is vapor-deposited on the glass vessel substrate. 150-250
Since the welding is carried out at a temperature of 0.degree. C., poor adhesion of the thin film may cause the film to peel off.The incidence of this is as high as approximately 30 to 40 degrees centigrade.

The wooden invention completely overcomes these conventional drawbacks and is a long-life and inexpensive E.
, C display device.

Hereinafter, explanation will be given based on FIG. 4 of the embodiment diagram. 2 is a container substrate, and 10 is an injection port. These structures are exactly the same as the conventional structure. 16 is the same adhesive as 9, and is a thermosetting type Evogishi adhesive that is stable in propylene carbonate liquid. 17
is a metal plate and is glued to a certain plate 2 with an adhesive 161. Reference numeral 18 is a low melting point metal that is used for final sealing after injecting the electrolyte, and generally uses a solder phase. Tore is the third
This is the same as the low melting point metal 15 in the figure. This manufacturing process will be explained. First, the adhesive 16 is printed on the device substrate by screen printing, and the metal plate 17 is set and fixed by thermosetting adhesive. Next, carry out the 9-cell process as usual, and inject electrolyte 6f using the vacuum injection method. Then, 18 halves of solder material are welded together using a soldering iron or the like. This metal plate 17 is a round plate made of phosphor bronze plated with Au and is manufactured in large quantities by press working and chemical etching.

Since the adhesive 16 is a thermosetting epoxy adhesive, the temperature and time used to melt solder chips hardly change.

The wooden invention is constructed as described above, and has the following advantages: 1. Since the adhesive for contacting the metal sheet metal is the same as the heat-resistant epoxy adhesive for forming the upper transparent substrate and the container substrate, the injection port sealing part reliability reaches a practical level.

High reliability can be obtained because a total of 2 degrees final sealing can be performed with a low melting point metal.

3゜This method has a low defect rate and can be rationalized, making it very inexpensive.

This means that an inexpensive E and C display device that can be mass-produced and has unprecedented high reliability has been achieved without making such wonderful improvements.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the structure of an electrochromic display device, Fig. 2 is a cross-sectional view of the inlet of a conventional method in which the inlet is completely sealed with an adhesive that hardens at room temperature, and Fig. 3 is a cross-sectional view of the inlet using a thin metal film. FIG. 4 is a cross-sectional view of an inlet according to the conventional method of forming an inlet and sealing the inlet with a low-melting point metal. FIG. Upper transparent substrate, 2°. instrument board, 3
゜. Transparent electrode, 4, wo311g, 5°. Background board, 6. . Electrolyte, 7. . Counter electrode, 8°, lead wire, 9°. Adhesive, 10°, injection port, 11°. Sealant, 12°. Low melting point metal, 13. , room temperature curing adhesive, 14°. Cr-
A? L thin film, 15°. Low melting point metal, 16°. glue,
17°. Metal plate, 18. . Low melting point. that's all

Claims (1)

[Claims] An electrolyte is sandwiched between a pair of substrates, at least one of which is transparent, and a plurality of display electrodes coated with an electrochemical coloring substance are formed on at least one of the substrates, and at least part of the plurality of display electrodes is formed. In the manufacturing method of the electrochromic display device in which the electrolyte is used to form the display pixels, the electrochromic display is characterized in that the electrolyte is sealed with solder using a pre-provided metal plate (f) in an IL method of sealing the injection port with the electrolyte. Method of manufacturing the device.