Lightpipe and integrating box provide uniform irradiance

摘要

Many electro-optical devices have components designed to achieve uniform illumination over a defined angular range. Examples include liquid-crystal displays in consumer electronics products - such as cellular phones and palm pilots - automotive dashboard lighting, and the backlit ring around some automobile ignitions. Good uniformity can be achieved using electroluminescence (EL) or a number of discrete LEDs (organic or inorganic), but the price of the electro-optical components makes these designs cost prohibitive for the high volumes in which consumer electronics devices and automobiles are produced.