Free Republic

Columbia Engineering researchers have created the first flat lens capable of correctly focusing a large range of colors of any polarization to the same focal spot without the need for any additional elements. Only a micron thick, their revolutionary "flat" lens is much thinner than a sheet of paper and offers performance comparable to top-of-the-line compound lens systems. The findings of the team, led by Nanfang Yu, associate professor of applied physics , are outlined in a new study, published today by Light: Science & Applications. A conventional lens works by routing all the light falling upon it through different...

TOKYO, April 12 - Sony Corp. said on Thursday it planned to start selling ultra-thin TVs using organic light-emitting diode (OLED) technology this year, aiming to become the first to market with a TV using the promising next-generation display. Several companies are investing in OLED technology because it can produce bright, colourful images and does not require a backlight as do liquid crystal displays (LCDs), allowing for a thinner panel. OLED panels are also said to be energy-efficient and good at reproducing fast-moving images. At a display forum in Tokyo, customers, suppliers and even rival TV makers turned their backs...