The highest display resolution of the LTDN50K220 is Full HD. That's 75% less display resolution than the most frequently found HD type of 4K Ultra HD. Full HD TVs have a resolution of 1920 x 1080 pixels.
Full HD TVs have a resolution of 1920 x 1080 pixels.
If you would prefer a TV with a higher display resolution then you might also want to look at the Philips 50PUT6400 (£399.00) (4K Ultra HD) which also has a higher rating.