a screen comprising a substrate on which a plurality of parallel phosphor stripes are formed, wherein at least three adjacent phosphor stripes are made of three different phosphors: a first phosphor to absorb light at an excitation wavelength to emit light of a first color, a second phosphor to absorb light at the excitation wavelength to emit light of a second color, and a third phosphor to absorb light at the excitation wavelength to emit light of a third color;

a laser module to project and scan a laser beam at the excitation wavelength onto the screen to convert an image carried by the laser beam via an optical modulation into a color image produced by the phosphor stripes on the screen;

a plurality of optical sensors positioned to receive and detect light from the phosphor stripes, wherein one optical sensor receives only one of colors emitted by the phosphor stripes on the screen;

a feedback mechanism that directs outputs of the optical sensors to the laser module; and

an alignment control mechanism in the laser module to control a timing of image data modulated on the laser beam to correct an alignment of the laser beam with respect to the phosphor stripes.