Drive circuit for video display panel

Details Drive circuit for video display panel Drive circuit for video display panel

1983-06-28

1984-12-11

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340793, 34082581, G09G 312

Patent

active

044881509

ABSTRACT:
There is disclosed an image display device including a thin film EL element with crossing scan electrodes and data electrodes, a modulation circuit for applying data pulses of a varying amplitude to the respective ones of the data electrodes, and a scan circuit for applying pulses of a fixed amplitude to the respective ones of the scan electrodes. The data pulses are supplied to the data electrodes via voltage follower drive stages which form part of the modulation circuit. Preferably, the data signals are digital-to-analog converted and held in a memory circuit for a while. Upon application of stepwise waveform signals in the memory circuit the data signals are thereafter digital-to-analog converted. The resulting analog amplitude from the digital-to-analog conversion is temporarily held in a gate capacitance and supplied to the EL element via the voltage follower drive stage.

REFERENCES:
patent: 3723749 (1973-03-01), Shapiro
patent: 3794990 (1974-02-01), Kishimoto
patent: 4087792 (1978-05-01), Asars
patent: 4110662 (1978-08-01), Greeneich et al.
patent: 4134132 (1979-01-01), Magos et al.
patent: 4237456 (1980-12-01), Kanatani
patent: 4251755 (1981-02-01), Bryden
patent: 4255238 (1981-03-01), Delapierre et al.

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