High-efficiency optical system for ultra-short-throw-distance projector based on multi-laser light source

— A novel laser-light-source projector having the three outstanding features of high brightness, ultra-short throw distance, and high color reproduction has been developed.These features have recently come to be required in the high-end projector market. The technologies for the laser-light-source projectors fully utilize the advantages of lasers, such as high luminance, small etendue, and high color purity. By integrating a triple-rod illumination system with a multi-laser light source and an ultra-wide-angle projection system, the developed high-efficiency optical system has achieved a brightness of 7000 lm and a throw ratio of 0.28 with an image size of 100–150 in. Another new technology, laser color processing (LCP), has offered vivid color reproduction which has a color gamut that is up to 180% wider than the BT.709 standard without appearing unnaturally colored. Furthermore, a speckle suppression effect produced by the multi-laser light source has been demonstrated. In this paper, an overview of these newly developed technologies that are used in the novel laser-light-source projector is presented, and solutions to the issues of speckle noise and safety are presented.