Ok first an imaging device is one the takes an image (camera, scanner, etc.). You would never see them in the sound manager either as it is for things that are about sound (Mics., Speakers, Headsets and sound devices or audio cards). To view the laptop on your tv you must connect the laptop to the tv using a cable (HDMI or similar). Windows, through your graphics driver, should then detect the new display. It is the graphics driver that will control the output. If you have HDMI you will get both sound and video. Perhaps if you give more detail and the model/make of your equipment we caqn be of more help.