AC coupled LCD annunciator control system

Details AC coupled LCD annunciator control system AC coupled LCD annunciator control system

1985-10-29

1988-03-01

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340784, 340811, 350332, G09G 318

Patent

active

047289465

ABSTRACT:
An AC coupled LCD annunciator control system including a primary backplane electrode associated with the primary character segments, an annunciator backplane electrode associated with the annunciator segments, a backplane drive for providing a drive signal for the primary backplane electrode, and a capacitor for coupling the drive signal to the annunciator backplane electrode; a plurality of annunciator segments; a resistor interconnected between each annunciator segment and the annunciator backplane electrode; and means for selectively switching the impedance level of each said annunciator segment from a level which is above that of the resistor to a level which is below that of the resistor to provide at the lower impedance condition an AC signal between the selected annunciator segment and the annunciator backplane electrode to actuate that selected annunciator segment.

REFERENCES:
patent: 3947721 (1976-03-01), Suenami et al.
patent: 4429304 (1984-01-01), Fujita

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