The highest display resolution of the Samsung UE40JU6050 is 4K Ultra HD. That's over four times the display resolution of a Full HD TV, which is the most frequently found display resolution. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
A 4K Ultra HD HD type is actually the best display resolution amongst all mid-size TVs that have been available for a similar time to the UE40JU6050.
Amongst similar types of television the worst display resolution is HD Ready.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
Other 4K Ultra HD televisions currently available that you might also want to look at include because of it's better review score, the Samsung UE40S9 (£649.00), the Thomson 40UA6406 (£458.86), or the LG 49UF778 (£315.00).