Electrochromic display devices using iron(III) hexacyanoferrate(II) salt
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United States of America Patent
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Feb 12, 1985
Grant Date -
N/A
app pub date -
May 25, 1982
filing date -
May 26, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electrochromic display device comprises an electrolyte contained between a pair of spaced-apart substrates. A set of electrodes are disposed on at least one of the substrates in contact with the electrolyte and a layer of electrochromic material is disposed on at least one of the electrodes to define a display electrode. The electrochromic material comprises a color-reversible salt of iron(III) hexacyanoferrate(II) which, depending on its oxidation-reduction state, exhibits different colors. A source of electric charge is connected through circuitry to effect reversible electrochemical oxidation and reduction of the salt of iron(III) hexacyanoferrate(II) to effect a corresponding reversible color change exhibited by the display electrode.
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