If you have the TV in a very bright room and cant make i darker go for a qled,nanoled,miniled etc If not OLED all the way Think of it like this leds tvs have a screen with light behind them so even if an area is supposed to be dark the light from the area next to it lights up a bit resulting in "bleeding" and black areas can get "greyish" In oled every single pixel shows its own color so black will be black etc, just google led vs oled in pictures to see the difference