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Occlusion technology has grown its importance for enhancing immersive augmented reality experiences by improving mutual depth perceptions between the real and virtual scenes. Among various methods for implementing occlusion in augmented reality displays, the 4f system method has gained a lot of attention for its capability to produce a sharp occlusion effect. However, this method has a drawback of having a large form factor and difficulty in achieving sharp occlusion when implemented to display multiple-depth images. Previous studies have applied a lens array to a 4f system to reduce the form factor. In this work, we numerically and experimentally investigate the use of a pair of Focus-Tunable Lenses (FTLs) along with a lens array 4f system to achieve sharp occlusion at multiple levels of depths in addition.
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Minseok Chae, Jehyeon Shin, Youngjin Jo, Yoonchan Jeong, Byoungho Lee, "Implementation of varifocal occlusion using lens arrays and focus-tunable lenses," Proc. SPIE 12443, Advances in Display Technologies XIII, 124430G (14 March 2023); https://doi.org/10.1117/12.2649558