LCD TVs have a light inside them to make the black – white contrast look better
LED TVs have LED light around the sides and through the back of the TV to make the best black – white contrast look the best so the blacks are blackest and whites are whitest
but LED cost way more than LCD and LCD looks pretty good
Suggestion:
Plasma tvs are an aging technology and use a lot of power and have image retention issues, they last for the shortest time, but give the closest picture to an old type CRT TV and are good for movies.
LCD and LED are esentially the same thing with a different kinda back light (LCD uses a flourescent lamp where LED uses many led lights). LED backlit LCD tvs (called "led tv") give deeper blacks and richer colours than lcd, but there are many very good lcd tvs with high black levels out there today, eg philips, samsung, sony, panasonic, sharp.
LCD is best for normal everyday use, LED is too expensive right now, plasma is on the way out!
