The LG 55UB9500 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.
A 4K Ultra HD HD type is in fact the best display resolution across all televisions of a comparable age and type to the 55UB9500.
Across comparable types of TV the worst display resolution is Full HD.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.