A display system comprises a processing circuit configured to receive image data from a video source, and generate a current image frame by generating pixel data as a function of the image data and storing the pixel data to a frame buffer. A graphic video driver is configured to display the image frame by reading the pixel data from the frame buffer and generating drive signals for the graphic display as a function of the pixel data read. The processing circuit also is configured to insert integrity data into the pixel data of the current image frame, wherein the position of the integrity data within the pixel data changes. The display system comprises a further processing circuit configured to read the pixel data from the frame buffer and verify whether the position of the integrity data within the pixel data changes.