Counterelectrode for an electrochromic indicating device

Details Counterelectrode for an electrochromic indicating device Counterelectrode for an electrochromic indicating device

1983-03-25

1985-12-31

Punter, William H.

G02F 117

Patent

active

045617295

ABSTRACT:
The counterelectrode (16) of an electrochromic indicator device is made of a paste of activated carbon and an organic binder baked on a metal plate (15). The shape of the metal plate can be dished after the layer is baked on without damage. Activated carbon in the counterelectrode, operating with the usual electrolyte and a transition metal oxide electrochromic electrode, makes possible a high-charge density from migration of ions with the application of very small voltages. The electrochromic effect can be extinguished simply by a short-circuit, especially if polyvinyl alcohol is provided as a supplementary binder by dipping the baked counterelectrode therein and baking again, and even more so if the activated carbon paste contains finely divided gold from decomposition of a gold compound during baking. The counterelectrode layer can be applied by screen printing.

REFERENCES:
patent: 3321286 (1967-05-01), Clark et al.
patent: 3767750 (1973-10-01), Groszek et al.
patent: 3829196 (1984-08-01), Deb
Arita et al., "WO.sub.3 -Type Electrochromic Display" National Technical Report (Japan) vol. 28 # 1, 2-1978, pp. 54-62.

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