Electrochromic display device capable of display in plural colors
First Claim
1. An electrochromic device, comprising;
- a transparent first substrate laid with a transparent electrode layer;
a second substrate which comprises an electrode layer and is arranged opposite to and spaced from the first substrate such that the electrode layers of the respective substrates are opposite to each other;
a first electrochromic layer which is formed on the electrode layer of the first substrate and is formed of a first electrochromic material selected from a group of materials of a particular coloring type and which takes on a characteristic first color in its electrochemically fully oxidized state;
a second electrochromic layer which is formed on the electrode layer of the second substrate and is formed of a second electrochromic material selected from said group of materials and which takes on a characteristic second color different from said first color in its electrochemically fully oxidized state;
seal means for holding the first and second substrates in the opposite and spaced arrangement and airtightly defining a space between the first and second substrates; and
an electrolyte liquid which fills up the space defined between the first and second substrates.
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Abstract
In an electrochromic (EC) display device having oppositely arranged two EC electrode layers, two kinds of EC materials each of which takes on a characteristic color by electrochemical oxidation, or by electrochemical reduction, are used in the two EC electrode layers, respectively, on condition that the characteristic color of one EC material differs from the color of the other EC material. For example, Prussian blue which colors in blue by oxidation and polytriphenylamine which colors in bronze by oxidation are used in combination. An alternative example is using a combination of WO3 which colors in blue by reduction and V2 O5 which colors in green by reduction. Since electrochemical oxidation of one EC electrode layer is usually accompanied by reduction of the opposite EC electrode layer, this EC device can be operated so as to selectively and alternately exhibit at least two different colors aside from colorless transparency.
25 Citations
7 Claims
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1. An electrochromic device, comprising;
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a transparent first substrate laid with a transparent electrode layer; a second substrate which comprises an electrode layer and is arranged opposite to and spaced from the first substrate such that the electrode layers of the respective substrates are opposite to each other; a first electrochromic layer which is formed on the electrode layer of the first substrate and is formed of a first electrochromic material selected from a group of materials of a particular coloring type and which takes on a characteristic first color in its electrochemically fully oxidized state; a second electrochromic layer which is formed on the electrode layer of the second substrate and is formed of a second electrochromic material selected from said group of materials and which takes on a characteristic second color different from said first color in its electrochemically fully oxidized state; seal means for holding the first and second substrates in the opposite and spaced arrangement and airtightly defining a space between the first and second substrates; and an electrolyte liquid which fills up the space defined between the first and second substrates. - View Dependent Claims (2, 3, 4, 5)
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6. An electrochromic device, comprising:
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a transparent first substrate laid with a transparent electrode layer; a second substrate which comprises an electrode layer and is arranged opposite to and spaced from the first substrate such that the electrode layers of the respective substrates are opposite to each other; a first electrochromic layer which is formed on the electrode layer of the first substrate and is formed of a first electrochromic material selected from a group of materials of a particular coloring type and which takes on a characteristic first color in its electrochemically fully reduced state; a second electrochromic layer which is formed on the electrode layer of the second substrate and is formed of a second electrochromic material selected from said group of materials and which takes on a characteristic second color different from said first color in its electrochemically fully reduced state; seal means for holding the first and second substrates in the opposite and spaced arrangement and airtightly defining a space between the first and second substrates; an electrolyte liquid which fills up the space defined between the first and second substrates; and an auxiliary electrode which is disposed in a marginal region of the space defined between the first and second substrates and which is electrically insulated from the electrode layers of the first and second substrates. - View Dependent Claims (7)
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Specification