Output circuit without overshoot and undershoot on signal lines driven alternately in the potential and negative potential ranges

摘要

The output circuit 11b of the liquid crystal display driver 11 has a first operational amplifier 11f having a rapid potential rise and a slow potential fall, and a second operational amplifier 11g having a rapid potential fall and a slow potential rise. Both the first and second operational amplifiers serve as voltage followers, and the first and second operational amplifiers are alternately connected to the data lines D0 / D1 of the liquid crystal panel 10 to change the horizontal period. Change the potential level on the data line between the constant voltage range and the negative voltage range with respect to the reference voltage level V _ref on the common electrode 12a of the pixels. The reset circuit 11j removes the non-inverting node and the output node. Forced reset to the reference voltage level at each instant between horizontal periods, connected to the first and second operational amplifiers, eliminating undershoot and overshoot due to slow potential changes from the potential waveform on the data line The.