To provide a novel driving method for driving an electronic device by using
digital gray scale and time gray scale in combination, which secures high
duty ratio, which can display an image normally even when a sustain period
is shorter than an address period, and which is hardly affected by dulled
signal waveform. In a sub-frame period (102) where a sustain period is
shorter than an address period, a clear period (105) is squeezed in
between completion of a sustain period (104) and start of an address
period of the subsequent sub-frame period. The length of the sustain
period (104) thus can be set without being limited by the length of an
address period (103). This non-display period is provided by changing the
electric potential of a storage capacitor line. Therefore, unlike the case
where the non-display period is provided by changing the electric
potential of a cathode wiring, the present invention is hardly affected by
dulled signal waveform.
