Patent ID: 7248253

Claim:
A pulse width modulated display system comprising: a light source and a projection lens for focusing incident light onto a screen; a digital micro-mirror device having a plurality of individual micro-mirrors arranged in an array, each micro-mirror pivotal about an arc in response to receipt of a drive signal applied to a driver cell associated with the micro-mirror to reflect light from the light source into the projection lens and onto the screen to illuminate a picture element (pixel) therein; a rotating color wheel interposed between the light source and the digital micro-mirror to successively impart each of three primary colors to the light striking the digital micro-mirror device and reflected thereby into the projection lens; a processor for forming sequences of pulse width segments, each controlling the brightness of a corresponding pixel for each color within a range of pixel brightness values lying between first and second pixel brightness boundaries by adjusting at least one selected pulse only in a first pulse width segment of an associated sequence unless all of the pulses in the first segment have the same state, whereupon the state of the of at least one selected pulse in a second pulse width segment is altered; and a driver circuit responsive to the sequences of pulse width segments formed by the processor for driving the digital micro-mirror device to illuminate the corresponding pixel, wherein each pulse width segment comprises five pulse width segments per color with each pulse width segment for each color interleaved with the segments for the other colors.