Abstract
AbstractProjection engines consist of an illumination section, a color system, and a projection section and are mostly based on discrete optical components such as color filters, mirrors, relay lenses, prisms, etc. These components are usually bulky, costly, and require accurate mounting. In this paper, a totally light‐pipe based projection engine is described. It consists of an etendue‐efficient illumination system using the dual paraboloid reflector system with a lensed tapered light pipe and a light pipe based polarization recovery system as the illumination section. The color system is also light pipe based with prisms, beam splitters, and light pipes. The outputs of the color system are then directed into the corresponding HTPS imager chips. The outputs from the imager chips are then recombined by an X‐cube and projected onto the screen. This light‐pipe based engine uses low cost optical components and take up much less space than the traditional projection engine.
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