Patent ID: 7130095

Claim:
An arrangement for correcting distortion of an image projected on a projection surface, comprising: a) a laser for emitting a laser beam; b) a scanner including a first scan mirror for sweeping the laser beam along a first scan direction to form a scan line on the projection surface, and a second scan mirror for sweeping the scan line along a second scan direction generally orthogonal to the first scan direction to form a raster pattern of scan lines on the projection surface, the scan lines having different lengths along the first scan direction due to different distances traveled by the laser beam between the second scan mirror and the projection surface, each scan line having a number of pixels along the first scan direction; c) a drive circuit for driving the first scan mirror with a drive signal having an amplitude; d) a feedback circuit for determining the amplitude of the drive signal for each scan line; and e) a controller for causing selected pixels to be illuminated, and rendered visible, by the laser beam to produce the image, and for adjusting the amplitude of the drive signal for each scan line to produce the scan lines of the image with the same length, thereby correcting for image distortion.