Correcting for image distortion in image projectors
First Claim
Patent Images
1. 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.
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Abstract
An arrangement for, and a method of, correcting for image distortion in an image projection system include making the scan lines of the projected image all of the same length by adjusting the amplitude of a drive signal used to sweep a laser beam to form each scan line of the image.
24 Citations
11 Claims
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1. An arrangement for correcting distortion of an image projected on a projection surface, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of correcting distortion of an image projected on a projection surface, comprising the steps of:
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a) emitting a laser beam; b) sweeping the laser beam with a first scan mirror along a first scan direction to form a scan line on the projection surface, and sweeping the scan line with a second scan mirror 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) driving the first scan mirror with a drive signal having an amplitude; d) determining the amplitude of the drive signal for each scan line; and e) causing selected pixels to be illuminated, and rendered visible, by the laser beam to produce the image, and 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. - View Dependent Claims (8, 9, 10, 11)
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Specification