Nonspherical LED Packaging Lens for Uniformity Improvement.

A conference paper about the uniformity improvement of the light emitting diode (LED) illumination system is presented. It compares the three different types of lens such as the hemispheroid, unoptimized and the lens after optimization. It discusses the non-spherical lens design approach used to optimize and improve the extraction energy and the spatial uniformity of the LED illumination system. It reveals that the new developed lens can improve uniformity from 28.4% to 64%.