Improving the color uniformity of a LED-array based illumination system with a tailored light distribution

摘要

We designed a compact illumination system based on a linear array of single package RGB LEDs which creates a tailored light distribution. Realistic optical simulations in Advanced Systems Analysis Program (ASAP) and a statistical approach in Matlab, are used to investigate the color uniformity. A clear trade-off between the capability to tailor the obtained light distribution and the color uniformity is found. Two methods to improve the color uniformity while maintaining the light tailoring capabilities of the optical design, are investigated: mixing the LED orientations and using anisotropic scattering properties. The aimed application is an illumination module for Ambilight television sets, although the investigated methods can be applied to other LED based illumination systems.