1977-02-14
1980-04-15
Segal, Robert
G02F 140
Patent
active
041981243
ABSTRACT:
In a sandwich type electro-optic display device which includes a transparent conductive substrate, an electrochromic layer (e.g. tungsten oxide applied to the substrate), a counterelectrode spaced from the electrochromic layer and a conductive medium, e.g. an acidic liquid ion conductive medium (sulfuric acid-glycerine solution) located in the space between the two electrodes; a protective layer deposited in situ on the electrochromic layer resulting from the doping of the liquid electrolyte with a salt of a cation having an ionic radius no less than 0.99 Angstrom units according to the classification of Pauling. Soluble isopolytungstic acid is formed at the interface between the electrochromic layer and the conductive medium as an "interfacial layer". The great cation salt selected is Ba.sup.++ and complexes with the polyacid to form a precipitate upon said electrochromic layer to form a protective layer therefor substantially inhibiting further attack on said electrochromic layer by the acidic conductive medium.
REFERENCES:
patent: 3282159 (1966-11-01), Jones et al.
patent: 3819252 (1974-06-01), Giglia
patent: 3836229 (1974-09-01), Saurer
Ebauches S.A.
Segal Robert
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