RESUMEN
A scheme of quarter-overlapped microlens arrays (QOMLA) is proposed to improve the display performance of integral imaging (II). The theory and the design of QOMLA is presented by the combination of geometric optics and wave optics and is verified by the optical experiments. The angular sampling density of the II system can be doubled in each dimension to further increase the spatial resolution. Multiple central depth planes can be constructed by adjusting the spacing of the multilayers, so as to expand the depth of field (DoF). Furthermore, QOMLA is easier to process when compared with the single-layer microlens array, and it reduces processing costs.
RESUMEN
A bionic-compound-eye structure (BCES), which is a substitute of a microlens array, is proposed to enhance the performance of integral imaging (II) 3D display systems. Hexagonal ocelli without gaps and barriers are predesigned to obtain a continuous image, high-resolution, and uniform parallax. A curved substrate is designed to enhance the viewing angle. In addition, ocelli are fused with the substrate to form a relief structure, BCES. When they are placed above a normal display, continuous and full-parallax 3D images with 150 µm effective resolution and a 28° horizontal, 22° vertical viewing angle could be achieved, about twice as much as that of normal systems. The weight of the BCES is 31 g, and the thickness of the whole system is 22 mm; thus, the BCES-based II (BCES-II) is very compact. In addition, this structure can be easily integrated into a cell phone or iPad for compact quasi-2D and 3D adjustable display.