CIRCUIT COMPENSATING RIPPLE, METHOD OF DRIVING DISPLAY PANEL USING THE CIRCUIT AND DISPLAY APPARATUS HAVING THE CIRCUIT

摘要

A ripple compensation circuit, which can efficiently remove a ripple signal, comprises: a reference signal generation unit to generate a plurality of reference signals of different levels; a comparison unit to determine the level of a ripple signal by comparing the ripple signal with the reference signals; a compensation signal generation unit to generate a ripple compensation signal having a phase opposite to the phase of the ripple signal in response to the determined level of the ripple signal; and a push-pull circuit to stabilize the ripple compensation signal. The comparison unit includes a plurality of comparators. Each comparator determines whether the ripple signal is a value between the two reference signals by comparing the two reference signals with the ripple signal. The compensation signal generation unit includes a plurality of amplifiers to receive output signals of the comparators. The amplifiers have different gain values. The ripple compensation circuit according to the present invention can efficiently remove the ripple signal by selecting the amplifier corresponding to the size of the ripple signal to generate the ripple compensation signal.