Patent ID: 7061460

Claim:
A method of driving a liquid-crystal display comprising the steps of: dividing one frame of an input signal into a plurality of subframes; applying a first pulse signal to a liquid crystal irrespective of a level of the input video signal, a pulse width of the first pulse signal corresponding to a duration of each subframe, application of the first pulse signal only not driving the liquid crystal; applying a second pulse signal to the liquid crystal in accordance with the level of the input video signal so that second pulses of the second pulse signal are superimposed on the first pulses at the same polarity, to perform pulse-width modulation to the liquid crystal; and setting an amplitude of the first pulse signal at a threshold voltage just before the liquid crystal is subjected to the pulse-width modulation and an amplitude of the second pulse signal at a voltage between the threshold voltage and a peek voltage at which the liquid crystal produces the maximum brightness or reflectivity; wherein an average duration P of the subframes and a response time L obtained by adding a rise time and a fall time of the liquid crystal meet the following requirements: P <L and P ≦ 0. 15 ×L.