Patent ID: 7030353

Claim:
An arrangement for controlling power during projection of an image on a projection surface, comprising: a) an energizable laser source for energizing a laser beam; b) a controller for energizing the laser source to emit the laser beam at a reference power level during a calibration mode, and at a display power level during a display mode; c) an image projector for sweeping the laser beam along mutually orthogonal directions across the projection surface at the reference power level to scan the projection surface during the calibration mode, and at the display power level to project the image on the projection surface during the display mode; d) a detector for detecting a reference detected level of light reflected from the projection surface during the calibration mode, and for detecting an actual detected level of light reflected from the projection surface during the display mode; and e) the controller being operative for controlling the energizing of the laser source when the detected levels of the light reflected from the projection surface are different.