Vector light field display based on an intertwined flat lens with large depth of focus

Abstract

The depth of focus (DOF) of a lens is a crucial parameter in glasses-free 3D displays that affects the viewing distance range. Here we proposed a vector light field display based on intertwined flat lens for extended viewing distance. The gray-scale diffractive lens (GDL) is designed and fabricated with extended DOF for red (658 nm), green (532 nm), and blue (450 nm) colors. By integrating the intertwined GDLs with a liquid crystal display, four views form a smooth horizontal parallax with a cross talk below 26% over a viewing distance from 24 to 90 cm. The enhancement of the DOF is 1.8 × 1 0 4 -fold. The light efficiency of the pixelated GDL reaches 82%. The proposed vector light field 3D display has the advantages of a thin form factor, high efficiency, high color fidelity, and large viewing distance. The potential applications include portable electronics, 3D TVs, and tabletop displays.

Revolutionary meta-imaging: from superlens to metalens

“…(a) Free-form MDL working at 850 nm with extremely long DOF (5-1200 mm) [189] . (b) Free-form MDL working at RGB (658 nm, 532 nm, 450 nm) with long DOF (2-10 mm) [202] . (c) Free-form diffractive lens over the visible region with large FOV (53°) [182] .…”

“…An alternative method to improve the MTF is to increase the thickness of the MDL as well as to change the design goal from focusing at every point along the propagation axis to focusing at just several discrete points on the propagation axis, which was proposed by Fengbin Zhou et al in 2022 and is shown in Fig. 24(b) [202] . The MDL works at RGB channels (658 nm, 532 nm, 450 nm) with large DOF to realize a vector light field display.…”

Performance improvement for additive light field displays with weighted simultaneous algebra reconstruction technique and tracked views

“…With multi‐projectors or a high‐speed projector, 9,10 project‐based light field displays can realize horizontal parallax with a viewing angle of 360°, while vertical parallax is comparatively challenging to achieve without tracking. Vector light field displays are a newborn technique based on precise light manipulation of each pixel with nanostructures 11 . It can deliver a 3D scene with a large DoF.…”

“…Vector light field displays are a newborn technique based on precise light manipulation of each pixel with nanostructures. 11 It can deliver a 3D scene with a large DoF. However, high-precision fabrication and alignment are required, and resolution is divided by viewpoint number.…”

Multifocal Plane Display Based on Dual Polarity Stereoscopic Metasurface

“…[1][2][3] The corresponding optical capture and display systems are going through the development from 2D systems such as cameras to 3D systems such as multiview display or holography techniques. [4][5][6] Various devices such as freeform lens, [7] diffractive optical elements (DOE), [8] and spatial light modulators (SLM) [9] have been used for 3D display. The key technologies usually rely on binocular disparity of distinct 2D images to offer the observer a 3D sensation.…”