A display apparatus includes a scanning assembly that scans about two or more axes, typically in a raster pattern. A plurality of light sources emit light from spaced apart locations toward the scanning assembly such that the scanning assembly simultaneously scans more than one of the beams. The scanning...http://www.google.es/patents/US6331909?utm_source=gb-gplus-sharePatente US6331909 - Frequency tunable resonant scanner
