Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1979-10-09
1981-11-03
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340813, 350357, G02F 117
Patent
active
042988705
ABSTRACT:
In a device for driving an electro-optical display element having a memorizing property and which produces color upon the application of a first polarity voltage thereto and loses color upon application thereto of a voltage of opposite polarity the coloration and the color-extinction taking place in response to a display command signal applied as an input to the device, there is provided means for detecting the quantity of charge stored in the display element and for generating a detection signal when the detected value of stored charge is beyond a predetermined range, means for continuously generating a pulse signal, and drive means having switch means adapted to be closed in synchronism with the pulse signal when the display command signal and the detection signal are applied as inputs, the drive means applying a voltage to the display element upon closing of the switch means.
REFERENCES:
patent: 3938131 (1976-02-01), Van Doorn et al.
patent: 4045791 (1977-08-01), Fukai et al.
patent: 4173758 (1979-11-01), Sekine
patent: 4205903 (1980-06-01), Inami et al.
patent: 4209770 (1980-06-01), Hamada et al.
Nippon Kogaku K.K.
Trafton David L.
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