A scan circuit unit includes a shift register unit; a first set of transistors operable to selectively transfer a first clock signal to a first output terminal in dependence on an output pulse signal of the shift register unit, and to selectively transfer an inactive level voltage to the first output terminal in dependence on a second clock signal; and a second set of transistors operable to selectively transfer the second clock signal to a second output terminal in dependence on the output pulse signal, and to selectively transfer the inactive level voltage to the second output terminal in dependence on the first clock signal.