The highest display resolution of the UE48JU6450 is 4K Ultra HD. That's over four times the display resolution of the most common HD type of Full HD. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
This television's display resolution (4K Ultra HD) is in fact the best display resolution amongst all TVs that were released around the same time as the UE48JU6450.
An HD Ready HD type is the worst display resolution across comparable types of television.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.