Method and Apparatus for Compensating for Distortion in a Scanned Beam System
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Abstract
A scanning system device has a predetermined aberration as it scans or switches light along selected optical paths. A deformable membrane receives the light and introduces an inverse “aberration” that offsets that of the scanning system. In one embodiment the scanning system includes a torsion arm that supports an oscillatory body. The torsion arm and/or body can be machined from metal, micromachined in silicon or formed in a variety of other ways. Alternatively, the scanning system may include a rotating polygonal scanner or other type of optical scanner. In another approach, an optical switch replaces the scanner.
89 Citations
23 Claims
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1. (canceled)
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2. A method for compensating for distortion in a scanned beam device comprising the steps of:
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scanning a beam of light across a field of view through a series of actual pixel locations; for each actual pixel location identifying at least one desired pixel location corresponding to the actual pixel location; wherein for at least one of the actual pixel locations, the corresponding at least one desired pixel location includes at least two corresponding desired pixel locations that differ in location from the actual pixel location due to distortion; determining for each of the identified actual pixel locations that differs from at least two desired pixel locations due to distortion a corresponding set of weighted data as a function of the distortion and image data for the at least two desired pixel locations; and modulating the beam of light according to the weighted data when the beam of light is aligned with the corresponding actual pixel location. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for producing a video image comprising the steps of:
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receiving data including pixel data; loading at least a portion of the received data into a buffer to form display data, wherein a plurality of pixels of display data in the buffer are distorted relative to the corresponding plurality of pixels in the received data; driving a scanned beam display with the display data to display an image substantially corresponding to the received data, wherein the scanned beam display includes distortion corresponding to the distortion of the pixel data in the buffer. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method of producing a scanned beam image comprising the steps of:
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storing data representing a rectilinear set of pixels in a buffer; for each line in the image, clocking the stored data out of the buffer at a set of clocking times; for each of the clocking times determining a location in a scanned beam pattern; for each of the clocking times, calculating a pixel intensity that is a weighted average of a plurality of the clocked out stored data; and substantially at each of the clocking times, emitting a beam of light that is modulated according to the corresponding calculated pixel intensity. - View Dependent Claims (21, 22, 23)
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Specification