A method for determining similarity of adjacent rows of an image, the method includes: obtaining feature value of corresponding sub-pixel of each row of image data in a frame of image data; compressing obtained feature values of the corresponding sub-pixels of each row of image data to obtain compressed feature values of the corresponding sub-pixels of each row of image data; subtracting compressed feature values of corresponding sub-pixels of two adjacent rows of image data in the frame of image data, and summing absolute values of multiple differences obtained from subtracting; and determining similarity of the two adjacent rows of image data in the frame of image data according to the summed value. The present application further provides a display device.