Overscan is a feature on television sets that crops visual information from the top, bottom and sides of a TV's display by zooming in on the picture. This is done to eliminate digital noise and static that is present in these parts of the frame on a lot of content. If you're using your television as a computer monitor; however, this digital noise will not be present and you can maximise your screen real estate by turning off overscan altogether.
Turn on your HDTV.
Press "Menu" on your HDTV remote to open the settings menu on screen. If your connected computer is powered on, this menu will display over the image of your computer's desktop.
Select the "Picture" option from the menu.
Select the option reading "Overscan" (if available). Certain television manufacturers use different terminology to describe this option, such as "Picture Size" or "Edge Control." Read the description of a particular menu option until you find the one that describes overscan.
Select "Off" (if available). Certain television sets may not provide an "On" and an "Off" option, but instead a "1" and a "2" option. In this situation, whichever option is the one that is currently selected will be the one that enables overscan, and whichever is the second option will be the one that disables overscan. Select the option that disables overscan. Press "Menu" on the remote to exit the menu.