Patent ID: 7697183
Filing Date: 2010-04-13
Classification: G02B,H04N

Abstract:
1. A scanning beam system, comprising: an optical module operable to produce a scanning beam of excitation light having optical pulses that carry image information; and a fluorescent screen comprising parallel fluorescent stripes that are displaced from one another along a first direction perpendicular to the parallel fluorescent stripes which are elongated along a second direction, the parallel fluorescent stripes absorbing the excitation light and emitting visible fluorescent light to produce images carried by the scanning beam, wherein the optical module comprises: a light source to produce the beam of excitation light; a horizontal polygon scanner to scan the beam of excitation light along the first direction on the screen; a vertical scanner having a single mirror that scans back and forth to scan the beam of excitation light from the polygon scanner along the second direction on the screen; a 1-dimensional scan lens placed between the polygon scanner and the vertical scanner to direct the beam of excitation light from the polygon scanner along a line on the vertical scanner and to focus the beam of excitation light onto the screen; and a controller that controls modulation of the beam of excitation light and adjust timings of the optical pulses, in response to displacements in position of the optical pulses along the first direction on the screen caused by scanning of the beam of excitation light along the second direction by the vertical scanner, to reduce the displacements in position of the optical pulses.