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High-brightness LED, a key component of technologies including ultra compact projectors
[2008, December 19]
1. Introduction
A light-emitting diode (LED) is a kind of devices using semiconductor, which extracts energy emitted at the electron-hole recombination as light. Its notable differences from conventional incandescent lamps and fluorescent lamps are its long life and, in principle, high conversion efficiency from power to light. For those reasons, it is attracting attention as a next-generation light source. Prior LEDs have relatively low brightness, inadequate to use for illuminations or image projections, although they can be applied to display devices. However, recent R&D on high-brightness and high-power of LED has advanced to the applications that can replace high-brightness light sources such as halogen lamps. The applications for auto headlamps and projector light sources can be cited as concrete examples. Especially in projector technologies, a LED light source can reduce the size, and can also restrict heating so that a new technology field of ultra compact projectors is being formed. Several companies including Toshiba Corporation have started developing ultra compact projectors of palm-sized and released their products. In the future, laptops or cell phones could be equipped with an ultra compact projector. In this report, we tried to analyze the technology trends of being rapidly developed high brightness LED, especially trends of its players with XLUS White®.