The L55F243N3 has a maximum display resolution of 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.
If the display resolution of this television is too low for you then you might want to look at the 65UF770 (£1,399.00) (4K Ultra HD), the 60UF770 (£1,199.00) (4K Ultra HD), or the 55UF7707 (4K Ultra HD) all from LG.