Driving method of display panel and display device

The embodiment of the invention discloses a driving method of a display panel and a display device. The driving method comprises the following steps: acquiring an original gray-scale value of each sub-pixel in an mth row and a target gray-scale value corresponding to a data voltage charged into each sub-pixel in an (m-1) th row; wherein m is an integer greater than 1; when the original gray-scale value of the m-th row of sub-pixels in the same column is greater than the target gray-scale value corresponding to the data voltage charged into the (m-1)-th row of sub-pixels, determining the target gray-scale value of each sub-pixel in the m-th row according to the original gray-scale value of the m-th row in the same column and the target gray-scale value of the (m-1)-th row of sub-pixels; and according to the target gray-scale value of each sub-pixel in the mth row, inputting a data voltage to a data line in the display panel, so that each sub-pixel in the mth row is charged with the corresponding data voltage.