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1 January 1987 Three Beam-Combining Schemes In A Color Projection Display
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Several beam-combining schemes for on-axis and off-axis optical system layout are presented. The on-axis approaches include two crossed plates with dichroic coatings placed at 90 deg, with respect to each other, and a pentaprism arrangement. The off-axis layout of the cathode ray tubes (CRTs) requires that the images be combined at the display screen. These image-combining approaches are compared for the standard television rates of 525 lines and the high-resolution television at 1200/2000 lines under development in Japan. The optimal color-combining scheme and the optical system that is designed with it depend on the specific performance requirements of the projection optical system. For the high-resolution requirements, an on-axis optical layout is necessary. For the high-performance, high-color fidelity, and high-resolution projection systems, which are expected to fit into a small volume of space such as a space station display or a cockpit panoramic display, a folded configuration with either crossed plates or penta-prism plates will result in an optimum color display. A slightly longer optical system will be needed if the color performance associated with the plate pentaprism layout is desirable.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marija S. Scholl "Three Beam-Combining Schemes In A Color Projection Display", Proc. SPIE 0818, Current Developments in Optical Engineering II, (1 January 1987);


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