A method provided by the present application comprises: obtaining a number n of rows of pixel units to be precharged; controlling a scanning driving chip to sequentially output n first scanning enable signals to a scanning driving circuit according to the number n of rows; and outputting a second scanning enable signal to the scanning driving circuit, so that the scanning driving circuit is controlled to output a second scanning signal to the pixel units of the n-th row to charge the pixel units of the n-th row.