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1. (WO1980002462) AFFICHAGE ELECTROCHROME UTILISANT DES DIPHTALOCYANINES DE TERRES RARES ET UN ELECTROLYTE AYANT UNE BASSE TEMPERATURE DE CONGELATION
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. An electrochromic display cell capable of assuming a plurality visually distinct optical states at very low temperatures comprising transparent electronically conductive display electrode means, counterelectrode means for establishing a potential difference relative to said display electrode means, a layer of electrochromic material disposed on said display electrode means, and an electrolyte material interposed between said film on said display el ectrode means and said counterel ectrode means in order to pass ionic current, characterized in that said electrolyte material is a concentrated aqueous solution of metal salt which solution freezes at a low temperature.

2. The display cell recited in claim l characterized in that said electrochromic material comprises a diphthalocyanine complex of lutetium or another rare earth element in the lanthanide series, or yttrium, scandium, or any other electrochromic diphthalocyanine.

3. The display cell recited in claim 1 characterized in that said electrolyte material comprises an aqueous calcium chloride
solution.

4. The display cell recited in claim 1 characterized in that said electrolyte material comprises an aqueous lithium chloride solution.

5. The display cell recited in claim 3 characterized in that said calcium chloride represents about 30% by weight of said solution.

6. The display cell recited in claim 4 characterized in that said lithium chloride represents about 25% by weight of said solution.