A scanning beam display system, comprising: a fluorescent screen comprising a plurality of fluorescent, materials, the fluorescent materials being separated by reflective servo reference marks, the fluorescent materials being filled between the reflective servo reference marks to form fluorescent stripes (1610, 1620, 1630) operable to emit visible fluorescent light in response to receiving excitation light; an optical module including a polygonal scanning mirror operable to produce an excitation light beam and scan the excitation light beam across a series of positions on the screen in a scanning direction, wherein the excitation light beam comprise a series of optical pulses that can carry image information, each optical pulse targeting a respective one of the series of positions on the screen, and wherein the optical module is operable to shape a beam cross-section of each optical pulse such that the cross-section is elongated along a respective fluorescent stripe, the respective fluorescent stripe being located at a screen position that is targeted by the optical pulse; an optical sensor; and a signal modulation controller, the signal modulation controller configured to adjust a timing of each optical pulse such that the optical pulse targeting the screen position at which the respective fluorescent stripe is located is turned on when a beam footprint is aligned to be within the fluorescent stripe in the scanning direction and turned off when the beam footprint is misaligned to be not within the fluorescent stripe, wherein the signal modulation controller is configured to detect misalignment by measuring, by the optical sensor, the signal strength of reflected light from the excitation light beam reflected by the reflective servo reference marks, thereby producing a monitor signal used for performing the timing adjustment. a fluorescent screen comprising a plurality of fluorescent, materials, the fluorescent materials being separated by reflective servo reference marks, the fluorescent materials being filled between the reflective servo reference marks to form fluorescent stripes (1610, 1620, 1630) operable to emit visible fluorescent light in response to receiving excitation light; an optical module including a polygonal scanning mirror operable to produce an excitation light beam and scan the excitation light beam across a series of positions on the screen in a scanning direction, wherein the excitation light beam comprise a series of optical pulses that can carry image information, each optical pulse targeting a respective one of the series of positions on the screen, and wherein the optical module is operable to shape a beam cross-section of each optical pulse such that the cross-section is elongated along a respective fluorescent stripe, the respective fluorescent stripe being located at a screen position that is targeted by the optical pulse; an optical sensor; and a signal modulation controller, the signal modulation controller configured to adjust a timing of each optical pulse such that the optical pulse targeting the screen position at which the respective fluorescent stripe is located is turned on when a beam footprint is aligned to be within the fluorescent stripe in the scanning direction and turned off when the beam footprint is misaligned to be not within the fluorescent stripe, wherein the signal modulation controller is configured to detect misalignment by measuring, by the optical sensor, the signal strength of reflected light from the excitation light beam reflected by the reflective servo reference marks, thereby producing a monitor signal used for performing the timing adjustment.