The 55LH545 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 you want a TV with a higher display resolution then you might also want to look at the UN55KU6500[pl_3445819_price] (4K Ultra HD), or the UE55KU6510[pl_3495170_price] (4K Ultra HD) both from Samsung or the LG 60UH625[plb_3437450_price] (4K Ultra HD).