Ratio of height to width of the viewing screen. Most older TV models were 4:3 screens, until recently when 16:9 widescreen became the standard. Widescreen computer monitors are often 16:10 ratio, and there are a few TVs available that are 2.35:1, a ratio sometimes seen in film, also known as Cinemascope.
LCD TVs almost always possess a back lighting , provided by a Cold Cathode Fluorescent Light.
Connects to your television and provides analog video inputs that split the video signal between three cables. Component video can carry progressive scan and high definition signals.