OLEDs are known for having a kind of clinical coldness to the colour gamut (read: "blue-ish"), but a Taiwanese researcher has worked out a way to up the temperature to the point where it comes very close to simulating sunlight.
Basically, he adjusted the voltage on a certain type of OLED, which produces a light very similar to natural sunlight. This is great for photographers, if they can get the wattage up enough to illuminate properly. It's just an experiment for now, but we could definitely see it coming to market either for photographers or even as a natural light simulator for those suffering from seasonal affective disorder. [OLED-Display via Crunchgear]