connected to the gate line 142 of the mth row turn on as a result the signal vsa is supplied from the source line 141 a to the electrode 144 a and the signal vsb is supplied from the source line 141 b to the electrode 144 b the potentials of the electrodes 144 a and 144 b are maintained at a substantially constant level even after the signal vg_m becomes low and the tfts 143 a and 143 b turn off due to the liquid crystal capacitances clc1 and clc2 and the storage capacitance cs supplying of the signals vsa and vsb to each column can take place one at a time dot sequential driving or take place all at once line sequential driving more descriptions will be provided based on fig1 the signal vc_m that is supplied to the opposite electrode 32 of the mth row reverses potential at the same time as when the signal vg_m becomes high level however the length of the cycle up to when the polarity of the signal vc_m reverses is twice the length in which the signal vg_m becomes high level in other words when the polarity of the signal vc_m reverses when the signal vg_m becomes high level then the next time the signal vg_m becomes high the polarity of the signal vc_m does not reverse then the signal vc_m reverses polarity again when the signal vg_m becomes high the length of the cycle up to when the signal vc_m reverses is the.