The highest display resolution of the UE48JU6440 is 4K Ultra HD. That's over four times the display resolution of a Full HD television, which is the most common display resolution. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
This TV's display resolution (4K Ultra HD) is actually the best display resolution across all similar spec televisions that were released more than a year ago.
An HD Ready HD type is the worst display resolution amongst similar types of TV.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
Alternative 4K Ultra HD televisions currently available that you might want to look at include the UE48JU6075, the UE40JU6075, or the UN48JS8500 all from Samsung which is cheaper.