Researchers at the Fraunhofer Institute -- partnered with project HYPOLED -- have created an OLED mini projector
prototype for mobile phones. Unlike many previous iterations of similar technologies, this new prototype doesn't need an additional illumination system, instead relying on a lens system to project images produced by an OLED onto a screen or wall -- making it both smaller and more energy efficient. The prototype currently displays a monochrome image with a brightness of 10,000 candelas per square meter, and color images with a brightness of about half of that. The lenses are also made of glass at this point, though cheaper and simpler plastic ones are in the works. No word on when we might see these prototypes hitting the streets in actual projector phones, though.