Electrochromic display apparatus

Details Electrochromic display apparatus Electrochromic display apparatus

1979-11-05

1982-01-05

Davie, James W.

Communications: electrical

Land vehicle alarms or indicators

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

340785, G02F 117

Patent

active

043090826

ABSTRACT:
In a container which contains an electrochromic solution, a pair of electrodes, namely an indication electrode and a counter-electrode are disposed and an electric circuit is constituted in a manner such that a D.C. pulse is impressed across the electrodes and thereafter the electrodes are shortcircuited to each other. By means of the shortcircuiting, a color indicating substance formed on the indication electrode by the electrochemical reduction reaction or electrochemical oxidation reaction is reversably dissolved from the indication electrode into the solution so as to erase the indication, and therefore contamination of the indication electrode is less and hence a longer life is achieved in comparison with conventional apparatus where such shortcircuiting is not made and simply an inverse pulse is impressed across the electrodes for erasing.

REFERENCES:
patent: 3912368 (1975-10-01), Ponjee et al.
patent: 3950936 (1976-04-01), Oguey et al.
patent: 3961842 (1976-06-01), Jasinski
patent: 4117475 (1978-09-01), Ebihara et al.
Schoot et al., "New Electrochromic Memory Display", Appl. Phys. Lett., vol. 23, No. 2, 15 Jul. 1973, pp. 64-65.
Schoot et al., "An Electrochromic Display with Memory", 1973, Symposium on Image Display, Technical Paper, pp. 146-147.

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