Free Republic

Microscale lenses and better materials move OLEDs closer to lighting our world. In an advance that could hasten the day when energy-efficient glowing plastic sheets replace traditional lightbulbs, a method for printing microscopic lenses nearly doubles the amount of photons coming out of the materials, called organic light-emitting diodes, or OLEDs. Stephen Forrest, an electrical engineer and vice president of research at the University of Michigan, says his technology increases the light output of the thin, flexible OLEDs by 70 percent. "They just create local curvature that allows light to pass through," he explains. This means that OLEDs, which are...

BLURRY snaps could be a thing of the past with the development of a digital camera that refocuses photos after they have been taken. The camera could be useful for action shots taken by sports photographers or for CCTV surveillance cameras, which often produce fuzzy shots due to poor lighting. In an ordinary digital camera, a sensor behind the lens records the light level that hits each pixel on its surface. If the light rays reaching the sensor are not in focus, the image will appear blurry. Now, Pat Hanrahan and his team at Stanford University have figured out how...