10 April 2005 Dual paraboloid reflector and light pipe based systems for projection displays
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With the pressure to reduce cost for mass-market introduction of microdisplay-based rear projection television (MD-RPTV), the image panel and the related optical components have to be reduced in size and novel optical arrangements have to be created to achieve the target price. One major issue always had been the need for more light. Traditional reflector systems, including elliptical and parabolic reflectors, perform well in most cases, but are inefficient for smaller etendue values corresponding to smaller image panels. The common remedy is to make lamps with shorter and shorter arcs to increase the coupling efficiency, but the corresponding lifetime of the lamps are reduced and most of the time, these short arc lamps can only operate at low power, thus limiting the total output of the illuminating system. This paper summarizes the progress in the last few years related to the dual Paraboloid reflector (DPR) system and the associated components including polarization recovery systems and light pipe based projection engines.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kenneth Li, Kenneth Li, Sheldon Sillyman, Sheldon Sillyman, Seiji Inatsugu, Seiji Inatsugu, } "Dual paraboloid reflector and light pipe based systems for projection displays", Proc. SPIE 5740, Projection Displays XI, (10 April 2005); doi: 10.1117/12.602369; https://doi.org/10.1117/12.602369

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