Nokia's revealing the secrets behind ClearBlack: its display technology that, even under the brightest sunlight, renders black as black as blackest night during a dark spell. Wedged above the E7, Lumia 800 and 900 displays are three thin layers, a linear polarizer, a quarter-wave retardation film and a reflecting surface. When light enters the first layer, it vertically aligns the "wave vibration" of the light so when it hits the retardation layer, it begins to rotate towards the right. Hitting the reflecting surface causes it to
