Full HD TVs are capable of showing high definition images that are up to five times as sharp and detailed as old style 'standard definition' images. You'll need to have an HD source, such as a Blu-ray player, games console or HD TV to be able to really see the difference though. All TVs on sale today are HD-Ready. A Full HD TV has a letter p after it and this means that the picture is shown in the best possible quality.