JPS61277928A - Electrochromic element - Google Patents

Abstract

PURPOSE:To solve the problems such as the decrease of a display function arising from the cell formation of an electrochromic element by drawing out respectively lower display electrodes and upper counter electrode to the rear side of a base body. CONSTITUTION:The lead-out electrode 4' of the upper counter electrode 4 and the lead-out part 2' of the lower display electrode 2 are respectively connected and led out through through-holes 11, 11' bored to the base body 1 to the lead- out electrodes 12, 13 provided on the rear sides of the base body 1. The rear side of the base body has only the lead-out electrodes and therefore the easy contact therewof with an outside driving source is made possible. Since the contact of the display part with the outside is made possible without using an inter-connector, etc., there is not feeling that the display is recessed. The beautiful display is thus made possible.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to electrochromic devices.

[Conventional technology]

An example of the structure of an electrochromic element is shown in FIG.

This device has a structure in which a lower display electrode 2 and its lead portion 2', an electrochromic layer 3, and an upper counter electrode 4 are sequentially laminated on a transparent substrate 1, and the electrochromic layer 3 is made of, for example, eNi(OH)
The first electrochromic layer 5 is composed of an oxidative color-forming substance such as Ta205, ZrO2, etc., L
It has an intermediate insulating layer 6 made of a fluoride dielectric such as iF or MgF2, and a second electrochromic layer 7 made of a reduction coloring material such as WOS. The transparent substrate 1 is made of a glass plate, a transparent resin plate such as polyimide, etc., and the lower display electrode 2 is made of an ITO film (5n02 doped in In203) or a Nesa film (5n02).

8 indicates a layer of insulator.

The electrocomic element with such a configuration has electrodes 2.
By applying a voltage between 6 and 6, an electrochemical reaction is induced and 1 coloring and decoloring are performed.

For example, layer 5 is made of Ir01, layer 7 is made of WOS, and layer 5 is made of Ir01 and layer 7 is made of WOS.
When applying a glass (+) side to the layer 7 side and a negative (-) side to the layer 7 side, I roz and WO, respectively, become IrOx +
yH20ad −+Ir0z(OH)y + yH+
+ye-WO5-)-7H+ +ye--→aywo
s (however, H20ad indicates adsorbed water contained in the element), the colored species Ir0x(OH)y, Hy
It is thought that WO5 is generated and colored, and by reversing the electric field, a reaction opposite to the above occurs and the color disappears.

In this coloring/decoloring reaction, the intermediate insulating layer 6 has H20ad
At the same time, it has the function of preventing reverse reactions due to recombination of colored species, in other words, conducting ions and blocking electrons.

Conventionally, when an electrochromic element having such a configuration and operation is connected to a drive system, the lower display electrode 2 is connected to the lead-out part 2', and the upper counter electrode 4 is connected to the lead-out part 2' from 4 in FIG.
When the device is assembled as a display cell, K is drawn out from the lead-out electrode provided on the base 1 shown in . Since the screen also needs to be pulled upward, the display section appears recessed, making it impossible to take advantage of the good appearance that is a feature of electrochromic devices. Furthermore, when the display in such a cell arrangement is viewed from the back side of the base 1, it appears to be recessed by the thickness of the base, which is not preferable.

[Problems to be solved by the invention]

The present invention has been made in order to solve the above-mentioned conventional problems, such as the deterioration of display function caused by cell assembly of electrochromic devices.

[Means for solving problems]

The above problem is solved in that, in an electrochromic element having a lower display electrode, an electrochromic layer, and an upper counter electrode laminated on a substrate, the lower display electrode and the upper counter electrode are respectively drawn out to the back side of the substrate. This is achieved by the electrochromic device of the present invention.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the attached drawings.

The same elements as in FIG. 2 are represented by the same reference numerals. In the example of FIG. It is connected to extraction electrodes 12 and 13 provided on the back side of the base 1 through through holes 11 and 11', and is extracted.

An electrochromic element having such a configuration can be manufactured, for example, by the following method.

A thistle hole 11 in a resist etc. on a substrate 1 made of glass etc.
, 11' are formed, thistle holes 11, 11' are formed using 7-acid or the like, and the resist is lifted off.

Next, on this substrate 1, a display electrode 2 was formed using an ion grating together with lead portions or electrodes 2/, , i/. At this time, conductive electrodes were also formed in the through holes 11 and 11'. (Ion brating has good recirculation, so electrodes can be formed inside the through holes 11.) Next,
Electrodes 12 and 13 to the drive system are formed on the back side of the glass in the same manner.

Further, electrodes and arm turns are formed on the back surface of the substrate.

This allows the drawer portions 12, 13 to be pulled out with good contact.

Next, an 8102 film was patterned on the portions 8 and 80 of FIG. t(5) was formed by a 3ooX sputtering method.
5 film 6 and WO5 film 7 at 3000X.

Finally, the ITO film 4.4) was formed to a thickness of 1000× using the ion grating method as shown in Figure 1.
Form an X. Note that the layer formation method, thickness, etc. can be changed arbitrarily.

〔Effect of the invention〕

According to the electrochromic device of the present invention, since only the extraction electrode is on the back side of the base, it is possible to make contact with an external drive source in bulk, and at the same time, the display portion can be brought into contact with the outside world without using an interconnector or the like. Because the edges are formed, the display does not feel recessed and a beautiful display can be achieved.

In addition, for example, during mask vapor deposition, the lead-out part is no longer coated due to wrap-around, resulting in defects, and the electrode can be pulled out more reliably, and the area of the lead-out electrode part has been reduced compared to conventional methods. It is possible to make it smaller. When the area of the electrode portion is reduced, it is possible to reduce color development defects of electrochromic caused by leakage due to intervention of dust and the like.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the structure of the electrochromic device of the present invention. The second factor is a cross-sectional view showing a configuration example of a conventional electrochromic element. 1... Transparent substrate, 2... Lower display electrode, 2'...
Drawer part, 3... Electrochromic layer, 4...
Upper counter electrode, 4'... Extraction electrode, 11, 11'
...Through hole, 12.13...Extraction electrode. Agent Patent Attorney Seki Yamashita Figure 1 Figure N2

Claims (1)

[Claims] An electrochromic element having a lower display electrode, an electrochromic layer, and an upper counter electrode laminated on a base, characterized in that the lower display electrode and the upper counter electrode are each drawn out to the back side of the base. .