Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1978-07-17
1980-08-26
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
368241, 340763, 340812, 350357, G06K 1518
Patent
active
042198097
ABSTRACT:
A driving circuit for an electrochromic display cell wherein writing and erasing of a segment is effected by relatively high write and erase transition potentials. After a predetermined transition period, the written and erased segments are stabilized at a desired coloration or transparency by application of a maintaining write potential(s) and a maintaining erase potential(s) respectively. The write maintain potential is periodically adjusted to a level whereby a predetermined charge level is maintained on the written segments. In this manner, a maintain potential on the segments(s) is periodically adjusted to compensate for degradation of the electrochromic material and to thereby maintain the desired contrast ratio between the written and erased segments.
REFERENCES:
patent: 3797225 (1974-03-01), Hama
patent: 3807832 (1974-04-01), Castellion
patent: 3839857 (1974-10-01), Berets
patent: 3881311 (1975-05-01), Hama
patent: 3908355 (1975-09-01), Wiesner
patent: 3932860 (1976-01-01), Cohen
patent: 3949242 (1976-04-01), Hirasawa
patent: 3950936 (1976-04-01), Oguey
patent: 3987433 (1976-10-01), Kennedy
Schwarzschild Jack
Willis Alan E.
Wilson Scott P.
Times Corporation
Trafton David L.
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