JP2590166Y2 - Double electrochromic device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrochromic device for electrically discoloring and erasing, and more particularly to an all-solid-state device using a plurality of electrochromic layers to improve the contrast ratio between coloring and erasing. Type double electrochromic device.

[0002]

2. Description of the Related Art Various types of electrochromic devices (hereinafter, simply referred to as ECDs) have been proposed. FIG. 2 shows a cross section of the basic configuration of an all solid thin film type ECD. The ECD 10 is composed of a glass substrate 11 having a lower transparent electrode 12, an Ir / Sn layer and Ta2.
An EC layer 13 composed of an O5 layer and a WO3 layer, an upper transparent electrode 15 facing the lower transparent electrode 12, and a sealing resin 1 for sealing the lower transparent electrodes 12, 15 and the EC layer 13 thereon.
4 and a sealing glass 16, and these are sequentially laminated. The sealing resin 14 provided so as to cover the EC layer 13 functions as a protective film for the EC layer 13 and prevents fluctuation of moisture and the like. And α- as EC material
When WO3 is used, the upper and lower transparent electrodes 1
When a voltage is applied between 2 and 15,

Embedded image Reaction occurs as shown in α-WO3 + ne− + nH + → HnWO3 to cause coloring. When the polarity of the applied voltage is reversed, a reverse reaction occurs and the color is erased.

[0003]

However, since the EC layer having the above structure is formed of a thin film, the coloring density is low, and therefore, there is a problem that a sufficient contrast ratio cannot be obtained with one set of ECDs. Therefore, it has been proposed to increase the coloring density by stacking a plurality of ECDs. In this case, since a large number of glass substrates and sealing glass are interposed, the transmittance at the time of decoloring is reduced. There was a problem. Therefore, an object of the present invention is to provide an electrochromic device in which the coloring density is increased without reducing the transmittance at the time of decoloring.

[0004]

According to the present invention, in order to attain the above object, two sets of electrochromic elements, each having a lower transparent electrode, an electrochromic layer, and an upper transparent electrode provided on a glass substrate in that order, are provided. The upper and lower transparent electrodes and the electrochromic layer are sealed with the sealing resin while the electrodes are separated and juxtaposed via a sealing resin so that the electrodes are adjacent to each other, and the upper transparent electrode and the lower transparent electrode are sealed. It is characterized by being colored by application of a voltage between them.

[0005]

According to the above construction, the coloring density is increased by increasing the number of colored layers using a plurality of EC layers without increasing the number of glass substrates, and the transmittance at the time of decoloring can be reduced by not increasing the number of glass substrates. To prevent.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG.
Is a cross-sectional view showing a schematic configuration of the ECD according to the present invention. The double ECD has two sets of ECD1 and ECD2, which are separated and juxtaposed via a sealing resin 3. ECD1,
Reference numeral 2 denotes ITO (I) formed by a sputtering method or the like.
ndium Tin O-xide) and other lower transparent electrodes 1b and 2b, an Ir / Sn layer, a Ta2O5 layer, and WO3.
Layers 1c and 2c, and lower transparent electrodes 1b and 2
b, the upper transparent electrodes 1d and 2d facing the glass substrate 1
a, 2a. And these ECDs
1 and 2 are separated and juxtaposed via a sealing resin 3 so that the upper transparent electrodes 1d and 2d are adjacent to each other. The sealing resin 3 covers and seals the lower transparent electrodes 1b and 2b, the EC layers 1c and 2c, and the upper transparent electrodes 1d and 2d of the ECDs 1 and 2. Α-WO3 or IrOx is provided in the EC layers 1c and 2c.
The upper transparent electrodes 1d, 2d are connected to each other, and the lower transparent electrodes 1b, 2b are connected to each other, so that the upper transparent electrodes 1d, 2d and the lower transparent electrode 1b,
A voltage is applied between the electrodes 2b and 2b to perform color erasure. The voltage is supplied by a power source E, and the applied polarity is set by switches S1 and S2.
Is performed by switching between.

In the above configuration, the glass substrates 1a, 2a
The transmittance when the transmittance of the EC layer 1c, 2c is 25% and the transmittance at the time of erasing are 95% and 95%, respectively. Table 1 shows a comparison with the case where

[Table 1] As can be seen from Table 1, according to the present invention, the transmittance at the time of decoloring is 10% higher than that of a field base where two sets of ECDs are overlapped, and from 80% as compared with the case of one set of ECDs. 76%
It has become possible to suppress the decline to. Further, when colored, the content was reduced from 24% to 7%, thereby making it possible to greatly improve the coloring density.

[0008]

According to the present invention, it is possible to minimize the decrease in transmittance at the time of decoloring and to increase the color density, thereby improving the display capability of the ECD.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of a dual ECD of the present invention.

FIG. 2 is a cross-sectional view illustrating a schematic configuration of a conventional ECD.

[Description of Signs] 1a, 2a Glass substrate 1b, 2b Lower transparent electrode 1c, 2c Electrochromic layer 1d, 2d Upper transparent electrode 3 Sealing resin

Claims (1)

(57) [Scope of request for utility model registration] 1. An electrochromic device comprising a glass substrate on which a lower transparent electrode, an electrochromic layer, and an upper transparent electrode are sequentially provided, via a sealing resin so that the upper transparent electrodes are adjacent to each other. The upper and lower transparent electrodes and the electrochromic layer are sealed with the sealing resin while being separated and juxtaposed, and are colored by application of a voltage between the upper transparent electrode and the lower transparent electrode. And a double electrochromic device.