Abstract: A device controls at least two projectors to project color channel images at multiple video levels, with partial overlap in an overlap region. Using at least one sensor, the device acquires digital images of the projected color channels and determines functions of projected brightness relative to video level for each projector's points. The device selects brightness levels for points outside the overlap region to blend brightness inside and outside the overlap region when projecting black images. The device then determines video levels for each color channel using the functions and controls the projectors accordingly.

Abstract: A method of operating an AC mercury lamp and DMD (Digital Micromirror Device) in a projection system, comprising receiving a periodic video frame pulse signal, switching the DMD between successive on and off states during each period of the frame pulse signal, wherein each off state results in a dark interval, and driving the lamp with a signal that is synchronized to the video frame pulse signal so as to alternate between a maintenance pulse level during at least a portion of the dark interval and a plateau level during the on state of the DMD.

Abstract: A method of operating an AC mercury lamp and DMD (Digital Micromirror Device) in a projection system, comprising receiving a periodic video frame pulse signal, switching the DMD between successive on and off states during each period of the frame pulse signal, wherein each off state results in a dark interval, and driving the lamp with a signal that is synchronized to the video frame pulse signal so as to alternate between a maintenance pulse level during at least a portion of the dark interval and a plateau level during the on state of the DMD.