The highest display resolution of the 55LF580 is Full HD. That's 75% less display resolution than the most frequently found HD type of 4K Ultra HD. Full HD TVs have a resolution of 1920 x 1080 pixels.
Full HD TVs have a resolution of 1920 x 1080 pixels.
We think you might also be interested in some of the alternative Full HD TVs currently available including the 50PFT6510, or the 55PFT6550 both from Philips which is cheaper.
If you want a TV with a higher display resolution then you might want to look at the Philips 55PUT6400 (4K Ultra HD and cheaper); or the LG 55UF770 (4K Ultra HD and higher rated).