Patent ID: 7746515
Filing Date: 2010-06-29
Classification: G02B,G09G,H03L,H04N

Abstract:
1. A method, comprising: activating a beam in response to a first portion of a clock that corresponds to a first predetermined location in a first line of a scan region as the beam moves in a direction, the clock having a phase; measuring a first intensity of the activated beam as the beam moves in the direction; activating the beam in response to a second portion of the clock that corresponds to a second predetermined location in a second line of the scan region as the beam moves in an opposite direction; measuring a second intensity of the activated beam as the beam moves in the opposite direction; weighting the first intensity by an amount that is related to the first location; weighting the second intensity by an amount that is related to the second location; and detecting an error in the phase of the clock from the weighted first and second intensities.