Driver circuit for liquid crystal display

Details Driver circuit for liquid crystal display Driver circuit for liquid crystal display

1975-07-14

1977-08-09

Corbin, John K.

Communications: electrical

Land vehicle alarms or indicators

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

340336, G02F 128

Patent

active

040407217

ABSTRACT:
A driver circuit connected to digit and segment electrodes on a liquid crystal display for providing saturating display voltages therebetween for "on" selected segments and sub-threshold voltages therebetween for "off" selected segments. Saturating voltages are obtained by applying an enabling signal to a digit electrode and an actuating signal to a segment electrode in a digit simultaneously. Sub-threshold voltages are obtained by applying quiescent signals to one or both digit and segment electrodes in the digit. An AC signal controllable in amplitude and frequency is utilized as the actuating signal applied to the selected segment electrode. Means are provided in the driving circuit for an initial adjustment of digit enabling and quiescent voltages as well as segment quiescent and actuating voltages.

REFERENCES:
patent: 3809458 (1974-05-01), Heuner et al.
patent: 3891306 (1975-06-01), Mitomo et al.
patent: 3911421 (1975-10-01), Alt et al.
patent: 3936676 (1976-02-01), Fujita
patent: 3938136 (1976-02-01), Kawakami

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