Wide-angle DMD Projection Lens
J. Brian Caldwell
Projectors using two digital micro-mirror devices (DMDs) chips were developed to take advantage of long-lifetime, short-arc metal halide lamps that have recently become available. These lamps emit much more light in the blue-green portion of the visible spectrum than in the red portion. Two chip projection systems can effectively use this type of lamp by splitting the spectrum into a red portion and a blue-green portion using dichroic filters.
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