1987-05-28
1989-07-25
LaRoche, Eugene R.
G02F 117, G02F 101
Patent
active
048506842
ABSTRACT:
The invention relates to an electrochromic (EC) display device which comprises a display electrode made up of a transparent conductive layer and a patterned EC layer, a counter electrode having an EC layer laid on a conductive layer and an electrolyte which occupies the space between the two electrodes, and in which the display electrode employs a first type EC material that takes on color in its electrochemically oxidized state, such as Prussian blue, and the counter electrode a second type EC material that takes on color in its reduced state, such as WO.sub.3, or vice versa. The EC layer of the counter electrode is not patterned, and the patterned EC layer of the display electrode is made smaller in surface area than the EC layer of the counter electrode and an upper limit of the surface area ratio of the former EC layer to the latter EC layer is specified. WHen this EC display device is driven in the usual manner coloration of the patterned EC layer takes place without perceptible coloration of the EC layer of the counter electrode.
REFERENCES:
patent: 4217579 (1980-08-01), Hamada et al.
patent: 4448493 (1984-05-01), Matsudaira et al.
patent: 4505021 (1985-03-01), Hamada et al.
patent: 4521081 (1985-06-01), Miyake et al.
patent: 4660939 (1987-04-01), Tsuchiya et al.
patent: 4699471 (1987-10-01), Miyake et al.
Inaba Hiroshi
Nakase Kiyoshi
Nishii Hiroyuki
Yanagida Yukitoshi
Central Glass Company Limited
LaRoche Eugene R.
McCutcheon Nathan W.
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