Driver circuit for an electroluminescent matrix-addressed displa

Details Driver circuit for an electroluminescent matrix-addressed displa Driver circuit for an electroluminescent matrix-addressed displa

1982-11-08

1985-11-19

Brigance, Gerald L.

Communications: electrical

Continuously variable indicating

With meter reading

340781, 340793, 3151693, G09G 330

Patent

active

045545391

ABSTRACT:
A driver circuit which operates in a switching mode is provided for an electroluminescent matrix-addressed display. The circuit has a row driver which switches a timed ramp voltage to a selected row of the display. A column driver is used to switch selected columns from a low to a high voltage. The column driver is pulse-modulated (PPM or PWM) so that each pulse is timed to coincide with the ramped voltage to provide a differential voltage peak which provides the desired brightness (or grey scale) at the pixel where the driven row and column cross.

REFERENCES:
patent: 4021607 (1977-05-01), Amano
patent: 4024529 (1977-05-01), Sakai
patent: 4087792 (1978-05-01), Asars
patent: 4443741 (1984-04-01), Tanaka et al.

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