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US 4,306,774 AGranted
Solid state electrochromic display
AssigneeRockwell International Corporation
InventorMargie W. Nicholson
Life of this patent
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Abstract
This invention is directed to a multicolored display which is based upon the rare-earth dipthalocyanines, and having a protonconductive, solid electrolyte which is selected for the electrochemical compatibility thereof with the electrochromic material in the display. Typically, the solid electrolyte consists of hydrogen uranyl phosphate or a related heteropoly acid.
Claims2
An electrochromic display cell comprising:
- a pair of enclosure plates, at least one of which is transparent;
- a counter electrode and
- a display electrode disposed between said enclosure plates;
- a layer of electrochromic material disposed on said display electrode, said layer of electrochromic material being selected from the group consisting of a diphthalocyanine of a rare-earth element, yttrium, and scandium;
- and
- a solid electrolyte material disposed between said counter electrode and said display electrode, said electrolyte material being selected from the group consisting of a heteropoly acid, and hydrogen uranyl phosphate (HUO.sub.2 PO.sub.r.4H.sub.2 O).
3 more elements
Dependencies are inferred from the claim text.