Lead reference and counter electrode for an electrochromic displ

Details Lead reference and counter electrode for an electrochromic displ Lead reference and counter electrode for an electrochromic displ

1974-09-20

1976-04-13

Smith, Alfred E.

Communications: electrical

Land vehicle alarms or indicators

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

340336, G02F 128

Patent

active

039500772

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 a display electrode and a non-polarizable counter electrode which simultaneously maintains a threshold potential while providing charge transfer to a electrolytically reduce the dye during a write cycle or oxidize the dye during an erase cycle. The preferred counter electrode forms a lead/lead phosphate half cell which has a substantially stable electrochemical potential over the area of operation, reversibly undergoes oxidation-reduction and will not substantially irreversibly reduce the dye. Further, the lead counter electrode can be electrochemically restored by reverse electrolysis.

REFERENCES:
patent: 3451741 (1969-06-01), Manos
patent: 3736043 (1973-05-01), Sambucetti
patent: 3806229 (1974-04-01), Schoot et al.
patent: 3854794 (1974-12-01), Van Dam et al.

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