Sampling and level shifting apparatus to operate in conjunction

Details Sampling and level shifting apparatus to operate in conjunction Sampling and level shifting apparatus to operate in conjunction

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

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