Power source for dot matrix LCD

Details Power source for dot matrix LCD Power source for dot matrix LCD

1991-04-26

1993-06-15

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

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

359 55, G09G 336

Patent

active

052203158

ABSTRACT:
A dot matrix liquid crystal display having segment electrodes and common electrodes, a segment driver circuit and a common driver circuit, a multi-level power source, sensor resistors connected in series to the supply voltage bus lines for the segment electrodes, amplifiers for detecting and ampifying the voltage drop in the sensor resistors, and capacitors for capacitively coupling the common electrodes and the amplifiers. When the segment voltage is changed, the voltage change is sensed through the sensor resister and is fed back to the common electrode to reduce the induced noise on the common electrode.

REFERENCES:
patent: 4427978 (1984-01-01), Williams
patent: 4506955 (1985-03-01), Kmetz
patent: 4893117 (1990-01-01), Blomley et al.

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