Multispectral composite projection system based on novel spectral time-division encoding technology

In current multispectral projection technologies, the colors projected by multispectral projection systems based on filter wheels depend on the characteristics of the light source and filters used. Although increasing the number of color channels, these systems still cannot reproduce arbitrary spectra. On the other hand, multispectral projection systems using multiple stacked projection devices require precise geometric calibration between devices, increasing the system's size and operational complexity. To address these problems, we propose an advanced multispectral composite projection system based on novel spectral time-division encoding technology. This system uses a beam shaping system to shape a visible full-spectrum light source, then employs a grating to split the light into different wavelengths. Finally, the high dynamic response of a DMD and a FSM is used to stack the spectra in the time domain, achieving the effect of multispectral composite projection. The experiments verify the effectiveness of the proposed multispectral composite projection system, demonstrating an expansion of the color gamut. The proposed system in this paper has potential applications in fields such as multispectral projection camouflage and wide-gamut projection.