The highest display resolution of the UN75HU8550 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 across all TVs of a comparable age and spec to the UN75HU8550.
Across comparable types of television the worst display resolution is Full HD.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.