A scanning beam display system, comprising: an excitation light source to produce at least one excitation beam having optical pulses that carry image information; a servo light source to produce at least one servo beam at a servo beam wavelength that is invisible and different from that of the excitation beam; a beam scanning module to receive the excitation beam and the servo beam and to scan the excitation beam and the servo beam; a light-emitting screen positioned to receive the scanning excitation beam and the servo beam and comprising a light-emitting area which comprises parallel light-emitting stripes which absorb light of the excitation beam to emit visible light to produce images carried by the scanning excitation beam, and feedback marks provided on the light-emitting screen, on the side of the light-emitting screen where the excitation beam and the servo beam are incident, the feedback marks reflect the servo beam and are configured to be optically transparent to the excitation beam, wherein the light-emitting stripes and feedback marks have a fixed and known spatial relationship; an optical servo sensor positioned to receive light of the servo beam scanning on the screen including light reflected by the feedback marks and to produce a monitor signal indicative of positioning of the servo beam on the light-emitting screen; and a control unit operable to, in response to the positioning of the servo beam on the screen in the monitor signal, adjust timing of the optical pulses carried by the scanning excitation beam based on a spatial relation between the servo beam and the excitation beam to control the spatial alignment of spatial positions of the optical pulses in the excitation beam on the light-emitting screen. an excitation light source to produce at least one excitation beam having optical pulses that carry image information; a servo light source to produce at least one servo beam at a servo beam wavelength that is invisible and different from that of the excitation beam; a beam scanning module to receive the excitation beam and the servo beam and to scan the excitation beam and the servo beam; a light-emitting screen positioned to receive the scanning excitation beam and the servo beam and comprising a light-emitting area which comprises parallel light-emitting stripes which absorb light of the excitation beam to emit visible light to produce images carried by the scanning excitation beam, and feedback marks provided on the light-emitting screen, on the side of the light-emitting screen where the excitation beam and the servo beam are incident, the feedback marks reflect the servo beam and are configured to be optically transparent to the excitation beam, wherein the light-emitting stripes and feedback marks have a fixed and known spatial relationship; an optical servo sensor positioned to receive light of the servo beam scanning on the screen including light reflected by the feedback marks and to produce a monitor signal indicative of positioning of the servo beam on the light-emitting screen; and a control unit operable to, in response to the positioning of the servo beam on the screen in the monitor signal, adjust timing of the optical pulses carried by the scanning excitation beam based on a spatial relation between the servo beam and the excitation beam to control the spatial alignment of spatial positions of the optical pulses in the excitation beam on the light-emitting screen.