The quality of the images improves with increased resolution. I advise purchasing a 4K TV if you have the money. - it's more expensive but much better quality. While 4K is 3,840 by 2,160 pixels, Full HD is 1,920 by 1,080 pixels. These words are used to describe a TV screen's resolution. Full HD is 1,906 x 640 pixels, while HD ready gives 1,366 x 768 pixels.