Patent ID: 8593711

Claim:
A scanning beam system, comprising: a display screen responsive to excitation light of an optical excitation wavelength to emit visible light of colors at optical wavelengths different from the optical excitation wavelength to display images carried by the excitation light; an optical module operable to produce a plurality of optical beams of the excitation light modulated to carry the images to scan over a surface of the display screen to produce the images on the surface based on a two dimensional scanning pattern, wherein the optical module comprises: a polygon scanner positioned in optical paths of the optical beams and comprising a rotation axis around which the polygon scanner rotates to scan the optical beams horizontally on the surface, and a plurality of polygon facets that are sized to simultaneously receive the optical beams and comprise a plurality of reflective polygon facets tilted with respect to the rotation axis at different facet tilt angles, respectively, to scan the optical beams horizontally at different vertical positions on the surface, respectively; a vertical adjuster placed in the optical paths of the optical beams to control and adjust vertical positions of the optical beams on the surface; a control unit that controls the vertical adjuster at a fixed position to place the optical beams at respective fixed vertical positions on the surface when the polygons scanner horizontally scans the optical beams to produce parallel horizontal lines on the surface; wherein the display screen is configured to provide a screen feedback signal to the optical module to indicate an alignment error of each optical beam on the display screen, and wherein the optical module is configured to detect the screen feedback signal for the alignment error of the each optical beam and to adjust the each optical beam to compensate for the alignment error.