Abstract
An offset voltage adjustment technique, which can be used to reduce the offset voltage of the buffer amplifier in the liquid-crystal display signal driver, is proposed. This adjustment, which is finished before driving the display panel, does not need to be adjusted for every row scanning cycle and does not increase the settling time. An experimental prototype output buffer implemented in a 0.35-µm CMOS technology demonstrates that the circuit draws only 4.5 µA static current and exhibits the settling times of 5 µs for a voltage swing of 2.5 V under a 600 pF capacitance load with a power supply of 3.3 V. The offset voltage is reduced from 18 mV to 4 mV.