I'll keep it short and sweet: If you're in the market for a 55-inch screen with an immaculate contrast ratio, beautiful color reproduction and 4K resolution, you'd be hard-pressed finding a set better than the OLED55E6. You've read about OLED elsewhere before, I'm sure, so I won't spend much time on it here and I'll just cover the basics. In brief, OLED passes an electric current through organic light-emitting diodes to create color on the screen. Each individual LED can be individually controlled, which means there's no need to have giant lamps sitting on the side of the screen or scattered uniformly across the back of the panel.OLED screens are more uniformly lit than LCD LED screens, have a better contrast ratio and, in most cases, have richer, more natural colors, too.