Application of LED for Projector Illumination

摘要

The function of illumination optics for projection displays is to direct light source onto a small area of microdisplay within a limited incident solid angle, and therefore the collection efficiency is especially important compared to other illumination applications, which is also the main technical issue for LED application to projection displays. This paper starts from the introduction of projector illumination optics and then illustrates the merit and drawback of exploiting LED as the light source for projection displays by comparing LED with traditional projector lamps. Finally a review on the LED illumination optics for projectors and development of LED dedicated for projectors will be given.