Two-dimensional optical scanner and method of driving the same

摘要

A two-dimensional image is displayed by causing a light beam scanning in a horizontal direction x to also scan in a vertical direction y. First photo-detector P is arranged in a region where the scan speed of the light beam in the first direction x is highest and the scan speed of the light beam in the second direction y is lowest, whereas second photo-detector Q is arranged in a region where the scan speed of the light beam in the second direction y is highest and the scan speed of the light beam in the first direction x is lowest so that both of the photo-detectors can accurately detect the scan timing of the light beam. Any possible error of synchronism of the horizontal scan of the light beam and the vertical scan of the light beam can be prevented by using the signals from the photo-detectors P, Q.