Column control circuit for plasma screen, comprises constant current source, voltage follower transistor and capacitor to charge the column capacity in preset time and means for discharge

摘要

The control block (14') supplies plasma screen columns (6) which have a capacity (C2) whose size is dependant on the state of adjacent columns. When the entry terminal (E) receives a logical 1 first and second groups of transistors (T4,T6,T7) (T3,T5,T8) are blocked and conducting. A constant current source (CS1) charges a capacitor (C) in a constant time and the output terminal (O) rises with the grid of the voltage follower transistor (T1)