Real-time spatial color holographic projection using non-iterative phase generation based on a phase light modulator

In real-time holographic displays, hologram computation time directly impacts the refresh rate and latency of the system. Spatial light modulators are used to load holograms and modulate light beam phases. However, existing phase generation methods cannot simultaneously achieve both fast hologram computation and high reconstruction quality of quantized phase holograms. We proposed a non-iterative phase generation method with quantization that enhanced the reconstruction quality of the spatial light modulator with fewer phase levels. A phase light modulator (PLM) with 16 phase levels was employed to validate the proposed method. Additionally, we optimized the conversion from phase holograms to PLM drive signals. Utilizing single graphics processing unit acceleration, we were able to speed up PLM drive signal calculation 25 times. Numerical and optical experiments demonstrate that the proposed method successfully implements modulator driving to achieve real-time holograms projection at 30 Hz. Display performance can be further enhanced through resolution improvement and speckle suppression.