The Samsung UE40JU6470 has a maximum display resolution of 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.
This TV's display resolution (4K Ultra HD) is in fact the best display resolution across all mid-size TVs that are a similar age to the UE40JU6470.
The worst display resolution across similar types of TV is HD Ready.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.