Analysis and enhancement for ultra-large depth-of-field light field display based on MEMS laser scanning projection arrays

Abstract

This study systematically analyzes factors limiting the depth of field in projection-based light field display systems, pinpointing two primary contributors: the blurring caused by traditional lens imaging principles at non-focus planes, and the increased light reconstruction errors induced by large-angle light diffusing devices. MEMS laser scanning projectors are employed as light sources to enable accurate focusing of reconstructed light at any distance. Furthermore, cylindrical lens compound diffusers with smaller diffusing angles are utilized to minimize the direction deviation of reconstructed light. Complemented by enhancing the density of the projection arrangements, the system–composed of 108 MEMS projectors–achieves substantial 3-meter depth of field and a frame size of 1.30 m × 0.75 m, delivering clear light field reconstruction around the diffusing devices. Corresponding experiments validate the theoretical analysis, demonstrating tremendous innovation and application value.