| 摘要 |
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.
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