A new rail-to-rail driving scheme and a low-power high-speed output buffer amplifier for AMLCD column driver application

A new high-speed, rail-to-rail driving scheme and a low-power, high-speed output buffer amplifier for active matrix liquid crystal display column driver application are proposed. Two complementary differential amplifiers to drive a pair of column lines are used to realize a rail-to-rail drive. The circuit achieves the large driving capability by employing a simple comparator to sense the transients of the input to turn on an auxiliary driving transistor, which is statically off in the stable state. This increases the speed without increasing static power consumption. They are demonstrated in a 0.35 /spl mu/m CMOS technology.