Design of a hybrid Total-internal-reflection Collimator

A hybrid structural total internal reflection (TIR) collimator is designed based on Snell's law for the secondary light distribution for the projectors. The performance of the system were evaluated through simulation. The illumination uniformity of the system reached over 94% and the luminous flux utilization rate was over 91% based on simulation using by LightTools software. The axial-symmetrical collimating system has various impressive features, for instance, simple and compact structure, small size, lightweight, and high illumination uniformity, which can meet the requirements of the augmented reality (AR) glasses or projectors.