Abstract: The invention provides an audio-video conversion device, relating to the field of TV, through converting the LVDS and/or V-by-One input port in the display into an HDMI port to make the display match the widely used HDMI audio-video processing device, so as to improve the flexibility of its adaptation; meanwhile, because the audio-video conversion device directly convert the TV signal in HDMI format into TV signal in LVDS and/or V-by-One format and then send it to the play device for playing, therefore there is no need to provide traditional LVDS chip and/or V-by-One chip on the display panel, and supports relatively high frequency to match frequency division and the frequency conversion of the screen, and then achieve the best image quality.