A system for driving columns of a liquid crystal display includes logic
circuitry operating in a supply path between a first and a second supply
voltage in which the first supply voltage is higher than the second
supply voltage. The logic circuitry is capable of generating first logic
signals and second logic signals whose value is equal to the first or
second supply voltage. The system includes two level shifters coupled to
the logic circuitry and operating in a supply path between a third supply
voltage greater than the first supply voltage and the second supply
voltage; the level shifters are capable of raising the value of the
second logic signals. The system also includes a first and a second pair
of transistors having different supply paths and having an output
terminal in common; the first and the second pair of transistors are
coupled to the level shifters to determine the drive signal of a column.
The system includes turnoff circuitry operating in a supply path between
the third and the second supply voltage and coupled to the two level
shifters. The turnoff circuitry is capable of keeping one of the two
pairs of transistors in a turnoff state in the period of time of a frame
when the other of the two pairs of transistors is operative.