Patent
1987-04-09
1988-09-27
LaRoche, Eugene R.
G02F 101
Patent
active
047737417
ABSTRACT:
The invention relates to an electrochromic (EC) display device having a transparent electrode layer coated with a first EC material which takes on color in its electrochemically oxidized state, such as Prussian blue, and an opposite transparent electrode layer coated with a second EC material which takes on color in its reduced state, such as WO.sub.3. For use in initial bleaching or coloration of one of the two EC layers, an auxiliary electrode is disposed in a marginal region of the space between the two opposite electrodes, and an electrolyte occupies the remaining space. An insulating covering permeable to ions intervenes between the electrolyte and the body of the auxiliary electrode, and an insulating layer substantially impermeable to ions intervenes between the auxiliary electrode body and each transparent electrode layer or the overlying EC layer to prevent leakage current. This manner of insulation of the auxiliary electrode is effective in shortening the length of time required for the initial bleaching or coloration treatment and extending memory time of the display device in actual operation.
REFERENCES:
patent: 4229080 (1980-10-01), Take et al.
patent: 4371236 (1983-02-01), Nicholson
patent: 4502934 (1985-03-01), Gazard et al.
Inaba Hiroshi
Nakase Kiyoshi
Nishii Hiroyuki
Yanagida Yukitoshi
Central Glass Company Limited
LaRoche Eugene R.
McCutcheon Nathan W.
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