Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1980-12-22
1983-07-26
Curtis, Marshall M.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340805, 340812, 340793, 340719, 350333, G09G 336
Patent
active
043957080
ABSTRACT:
Apparatus which is utilized with a liquid crystal display for applying alternating current driving signals thereto, derived from applied direct current analog signals. The apparatus includes circuitry which samples and stores the applied analog signal. The apparatus also includes circuitry which level shifts the sampled signals so as to have voltage levels which are symmetrically disposed above and below a reference level associated with the liquid crystal display during alternating field times. The symmetrically disposed signals constitute applied alternating current signals to the display, with respect to the reference level.
REFERENCES:
patent: 4100579 (1978-07-01), Ernstoff
patent: 4137523 (1979-01-01), Mukaiyama
patent: 4231035 (1980-10-01), van Doorn et al.
patent: 4298866 (1981-11-01), Hodemaekers
Curtis Marshall M.
Himes Robert H.
Hughes Aircraft Company
Karambelas Anthony W.
Link, Jr. Lawrence V.
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