Regenerating electrode for electrochromic display cell

Details Regenerating electrode for electrochromic display cell Regenerating electrode for electrochromic display cell

1974-09-20

1976-06-08

Corbin, John K.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340336, G02F 128

Patent

active

039618420

ABSTRACT:
Disclosed is an improved electrochromic optical display cell having a memory, long life, good contrast independent of viewing angle, reversibility, low switching voltage, and a low mean power consumption wherein a soluble colorless dye is selectively and reversibly reduced at a display electrode to form an insoluble, insulating film that markedly absorbs visible light. The electrochromic display cell includes an electrode through which a potential is applied across the cell to regenerate the coulombic capacity of the counter electrode. The counter electrode is regenerated by reverse electrolysis without deleteriously affecting cell operation. In a preferred embodiment, the regeneration electrode is palladium.
In another embodiment, the display electrode normally present in the display cell is utilized as the regeneration electrode. The potential applied across the cell for regeneration is larger than the normal potential applied to erase the cell.

REFERENCES:
patent: 3736043 (1973-05-01), Sambucetti
patent: 3806229 (1974-04-01), Schoot et al.
patent: 3843232 (1974-10-01), Berets
patent: 3854794 (1974-12-01), Van Dam et al.

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