Display system architectures for digital micromirror device (DMD)-based projectors

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Abstract
The Digital Micromirror Device (DMDTM) developed by Texas Instruments is a highly useful Micro-Opto-Electro-Mechanical Structures (MOEMS) device that enables high quality projection display. Acting as a semiconductor light switch, the DMD can modulate incident light to produce truly digital projection display systems. Illumination and projection optics are described for three fundamental display system architectures based on the DMD light modulator. These systems include one, two, and three DMD configurations all producing full color image projection. The single device configuration implemented with a rotating color filter system represents the least system hardware while providing the capability of full color and a high brightness monochromatic mode. A two device configuration using a rotating color filter combined with a secondary color splitting filter is of particular interest when using a light source that is spectrally imbalanced. The two device configuration is also capable of a high brightness monochromatic mode of operation. The three device configuration is the most efficient with respect to light throughput considerations providing the highest brightness full color projection with the DMD light modulators. Comparisons of system performance characteristics are described indicating the features of each configuration.

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