| US 7,491,919 B2 | ||
| Circuit for detecting a clock error in a scanned-image system and related circuits, systems, and methods | ||
| David Skurnik, Kirkland, Wash. (US); Mark Freeman, Snohomish, Wash. (US); Randy Sprague, Carnation, Wash. (US); Margaret Brown, Seattle, Wash. (US); and Harpal Sira, Surrey (Canada) | ||
| Assigned to Microvision, Inc., Redmond, Wash. (US) | ||
| Filed on Dec. 21, 2005, as Appl. No. 11/316,683. | ||
| Claims priority of provisional application 60/638274, filed on Dec. 21, 2004. | ||
| Prior Publication US 2006/0187497 A1, Aug. 24, 2006 | ||
| Int. Cl. H01L 27/00 (2006.01); H01J 3/14 (2006.01) | ||
| U.S. Cl. 250—208.1 [250/234] | 13 Claims |
| 1. An image system, comprising:
a beam sweeper;
a first driver operable to drive the beam sweeper in a first dimension such that the beam sweeper has a sweep phase;
a clock generator operable to generate a pixel clock having a clock phase;
a beam generator coupled to the clock generator and operable to direct a beam toward the beam sweeper in response to the pixel
clock;
a sensor operable to detect the beam redirected by the beam sweeper; and
a phase detector coupled to the sensor and operable to detect an error in the clock phase from the detected beam; and
further comprising a phase shifter coupled to the phase detector and operable to shift the clock phase in a direction that
reduces the error in the clock phase, wherein the phase shifter is capable of adjusting the clock phase of the pixel clock
in increments of less than one pixel.
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