A display device, for displaying a video signal including a plurality of successive image frames comprising a timing controller, a scaler controllable to enter an operating state or an off-operating state, a buffer and a comparator, wherein: the scaler is adapted for performing scaling processing on the image frames of the video signal to generate pixel data for display; the buffer is adapted for storing the pixel data obtained by the scaling processing on the image frames of the video signal by the scaler; the comparator is adapted to compare whether pixel data of a current image frame from the scaler are identical with the pixel data of an image frame stored in the buffer or not and to output a comparison result; the timing controller is adapted to acquire pixel data to be displayed and to output the pixel data for display; and wherein the scaler is adapted to enter the off-operating state which lasts for a predetermined time period or a predetermined number of image frames which are preset or flexibly settable, if the comparison result outputted by the comparator indicates that pixel data of a current image frame from the scaler are identical with the pixel data of an image frame stored in the buffer, and wherein in the off-operating state: the scaler is adapted to stop operating, and the timing controller is adapted to acquire the pixel data stored in the buffer to display a corresponding frame image until the scaler enters the operating state again after the predetermined time period or the predetermined number of successive image frames have passed; and wherein the scaler is adapted to enter or keep the operating state and to perform scaling processing on a subsequent image frame, if the comparison result outputted by the comparator indicates that pixel data of a current image frame image from the scaler are not identical with the pixel data of an image frame stored in the buffer, wherein in the operating state: the timing controller is adapted to acquire pixel data obtained by the scaling processing on the current image frame by the scaler so as to display the corresponding frame image, and wherein the buffer is adapted to update the pixel data stored in the buffer with pixel data of the current image frame after the scaling processing by the scaler. the scaler is adapted for performing scaling processing on the image frames of the video signal to generate pixel data for display; the buffer is adapted for storing the pixel data obtained by the scaling processing on the image frames of the video signal by the scaler; the comparator is adapted to compare whether pixel data of a current image frame from the scaler are identical with the pixel data of an image frame stored in the buffer or not and to output a comparison result; the timing controller is adapted to acquire pixel data to be displayed and to output the pixel data for display; and wherein the scaler is adapted to enter the off-operating state which lasts for a predetermined time period or a predetermined number of image frames which are preset or flexibly settable, if the comparison result outputted by the comparator indicates that pixel data of a current image frame from the scaler are identical with the pixel data of an image frame stored in the buffer, and wherein in the off-operating state: the scaler is adapted to stop operating, and the timing controller is adapted to acquire the pixel data stored in the buffer to display a corresponding frame image until the scaler enters the operating state again after the predetermined time period or the predetermined number of successive image frames have passed; and wherein the scaler is adapted to enter or keep the operating state and to perform scaling processing on a subsequent image frame, if the comparison result outputted by the comparator indicates that pixel data of a current image frame image from the scaler are not identical with the pixel data of an image frame stored in the buffer, wherein in the operating state: the timing controller is adapted to acquire pixel data obtained by the scaling processing on the current image frame by the scaler so as to display the corresponding frame image, and wherein the buffer is adapted to update the pixel data stored in the buffer with pixel data of the current image frame after the scaling processing by the scaler.