JPS5872130A - Electrochromic display element - Google Patents

Abstract

PURPOSE:To obtain an ECD element which permits displaying with many different colors and sure and quick recognition of various kinds of information by packing a mixture consisting of plural kinds of transition metallic oxides as an electrochromic (EC) material. CONSTITUTION:A transparent display electrode 2 of In2O3-SnO2 is ofrmed on the surface of a transparent glass plate 1, and an EC material film consisting of a mixture of plural kinds of metallic oxides (for exmpale, a mixture of WO3, V2O5, etc.) is vapor deposited on the electrode 2, whereby a color developing layer 3 is formed. A solid-state insulating layer 4 is provided by vapor deposition of CaF2 on the layer 3 and a counter electrode 5 for the display electrode 2 is formed of Au on the layer 4. The Au is vapor deposited to 100-200Angstrom thickness to the semitransparent type that can utilize rays from either direction of the front side and rear side. If the voltage conditions to be applied upon the light emitting layer 3 are selected by, for example, compounding ratios of WO3 and V2O5, the element is made colorable to different hues of blue, bluish green, dark green and brown.

Description

Detailed Description of the Invention The present invention relates to a display element using a so-called electrochromic material (hereinafter abbreviated as EC material), which is a substance whose visible light absorption characteristics change when energized. (omitted)).

In recent years, EC that utilizes reversible coloring and decoloring reactions through electrochemical redox reactions of EC materials made of transition metal oxides has been developed.
D has been developed.

The basic structure of such an ECD is represented by a display electrode/coloring layer/counter electrode. As a specific example, WO3 as the EC material is vapor-deposited on the transparent electrode of the display electrode made of an ITO thin film, and then Au is deposited through an electrolyte solution. A counter metal electrode consisting of was provided. In this case, if the display electrode is set at a negative potential of 1 to 2 V with respect to the counter electrode, a blue color develops, and if the polarity of the applied voltage is reversed, the EC material film returns to its original transparent state.

Although the mechanism of color development and decolorization has not yet been completely elucidated, it is a reaction due to the injection of protons and electrons from the electrolyte solution injected into the woB, that is, the color development W 03−+ x M” ”+ x e −=Mx W
03 Decolorization However, in the O configuration, which is considered to be a sudden absorption due to the lateral movement of captured atoms such as M=H, LL, ..., etc., the EC material film is formed under the applied voltage conditions between the display electrode and the counter electrode. In response to this, only two colors of transparent (to) blue change are performed, and MOo3 t V2 o'5 is used as an EC material instead of WO8.
t'Tj 02 etc. may be used, and depending on each material, it is possible to obtain a color change of transparent O blue, light yellow 0 gray green, transparent 0 gray green, but all of these can be changed depending on the purpose of use. It was impossible to produce 1@ lees in a pot with a small amount of water.

This invention is (1) The display is very clear.

) There is no visual angle dependence, and the display can be recognized from any angle.

(3) 0 with memory function on display (4) Can be driven at low voltage, resulting in low power consumption.

(5) Since it is a non-luminous type, it is suitable for use in bright places. □ In addition to the ECD with the following features, the purpose of this is to provide an EC'D that can be set to seven different hues depending on the purpose of use, and has a display pole and a counter pole, and a In this ECD, the EC material is a mixture of a plurality of types of transition metal oxides.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of the ECD of the present invention, in which ITO is coated with a film thickness of 200 mm on one surface of a transparent glass substrate 1 serving as a display side substrate.
A display electrode 2 is formed by vapor deposition in a shape corresponding to the display pattern, and an EC material made of a mixture of multiple transition metal compounds is coated over the display electrode 2.
Forming a coloring layer 3 by vapor deposition to a thickness of 3000 to 5000λ,
This coloring layer 3 is covered with CaF2 with a film thickness of 4000 to 600.
A solid insulating layer 4 is formed by vapor deposition tLj7r at 0λ, and a counter electrode 5 made of Au is further provided on this solid insulating layer 4 facing the display electrode 2. The counter electrode 5 has a film thickness of, for example, 100
By setting ~200λ, it is a semi-transparent type that can utilize light from both the display side and the back side of the ECD, and the film thickness is 2.
If the value is set to 000 to 3000, it is possible to set 26 reflection types each that utilizes light rays from the direction of the display side of the ECD.

FIG. 2 shows WO3 with 93.0 as the first embodiment of this invention.
・An EC substance mixed with 8% V2O5 and 6.2% V2O5 is shown in FIG. 3 as a second embodiment of this invention, with 87.6% WO3 mixed with 12.4% V205. Figure 4 shows the EC material of this invention (Example D) with 64.7% WO3 and 35.3% V2 o5.
Figure 5 shows W 03v44.0% as the fourth embodiment of the present invention.

1 EC substance mixed with v205 at a ratio of 56.0%
It is a diagram showing the wavelength-transmittance characteristic ratio when the applied voltage conditions of each E'CD used in the light emitting layer 3 are set variously, and as the mixing of v2o5 increases, the longer wavelength side As the transmittance increases, the transmittance on the shorter wavelength side decreases, resulting in blue, blue-green, and dark green colors, respectively.

A candy m with a different hue of brown appears.

In the above embodiment, WO6 and V3 were used as the EC materials of the coloring layer 3.
! Regarding the mixture of 05 and
Other transition metal oxides MQO3゜T L' 0
Similar effects can be obtained with 2 + I r (OH) n and the like by selecting combinations and mixing ratios.

As described above, according to the electrochromic display element of the present invention, the electrochromic substance used in the coloring layer is a mixture of multiple types of transition metal oxides, so that the combination and mixing ratio of the transition metal oxides as the electrochromic substance The above-mentioned (1) ~ that it is possible to obtain any hue umbrella # element according to the purpose of use by selecting R1jl
It produces effects comparable to those of the special number (5), and can be used in a wider range of fields.For example, it is used as a display device for vehicle instruments such as automobiles, which have become increasingly computerized in recent years. , it is possible to display in a wide variety of colors while taking advantage of the space factor of electrochromic display elements, and by effectively appealing vehicle and driving information to the driver's senses, reliable recognition and recognition can be achieved. It allows for appropriate treatment to be carried out in a short period of time.
This allows for stable driving at all times.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of an electrochromic display element according to an embodiment of the present invention, and FIGS. It is a figure showing the wavelength-transmittance characteristic in an example. 1: Transparent glass 2: Display electrode 3: Coloring layer 4: Solid insulating layer 5: Counter electrode Figure 1 112 Figure 8 4r; 4 51!1 Wavelength (nm) Wavelength (nm) Indication of procedural amendment case Patent Application No. 170,969 of 1988 Name of the Invention Electrochromic display element correction person 2 $34 Drawings subject to sound correction (1) Attach drawings 2, 3, 4, and 5 I will make the corrections as per the attached sheet. Above 2m Figure 8 2 WOl 2 "L shrimp /"". Fourteenth wavelength (nm) Wavelength (nm) @4Im
5th m shi WO・Sho straddle song 2.7 C1-1-2-11δ1

Claims (1)

[Claims] An electrochromic display element comprising a display electrode and a counter electrode, with an electrochromic substance and a solid insulator filled between the electrodes, wherein the electrochromic substance is a mixture of multiple types of transition metal oxides. An electrochromic display element characterized by: