The highest display resolution of the UE48JU6770 is 4K Ultra HD. That's over four times the display resolution of the most frequently found HD type of Full HD. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
A 4K Ultra HD HD type is in fact the best display resolution amongst all TVs that came out around the same time as the UE48JU6770.
The worst display resolution across comparable types of TV is HD Ready.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
There are a number of other 4K Ultra HD TVs currently available that you might also want to look at including a cheaper TV such as the UE40JU6075, or the UN48JS8500 both from Samsung or you might consider a higher scoring TV such as the Panasonic TX-40CX700 (£573.00).