The present invention provides a scan driver and a display using the same. The scan driver includes multiple stages of driving units. The driving units are controlled by a start signal, a clock signal and at least one selection signal. The ith stage of the driving unit includes a shift register and a de-multiplexer. The shift register generates a scan signal according to the clock signal and a trigger signal. The de-multiplexer selectively outputs the scan signal to multiple scan lines according to the at least one selection signal. The trigger signal of the 1st stage of the driving unit is the start signal, and the trigger signal of the (i+1)th stage of the driving unit is the scan signal of the ith stage of the driving unit.