Hybrid Computational Near-Eye Light Field Display

Abstract

We propose a hybrid computational near-eye light field display based on microlens arrays (MLAs) and structure parameters prioritization method (SPPM) that can render correct accommodation and expand the depth of field (DOF). The proposed display consists of two MLAs and two micro-displays. Two sets of depth-sliced images are superimposed to reconstruct the object's light field. The system's ray resolution and the spectra difference between the proposed light field and the conventional one are discussed. The DOF of the proposed system is extended without the requiring of high refresh rate display. Furthermore, SPPM is proposed to extend the spatial frequency of the light field. A prototype is demonstrated and the experimental result shows that the depth field of the reconstructed images is significantly increased compared with conventional near-eye light field display based on single MLA.

68‐1: Investigation on Defocusing‐Induced Accommodation Shift in Microlens Array‐Based Near‐Eye Light Field Displays

“…Regarding the visual discomfort, the near-eye light field display (NE-LFD) technology, which presents both positional and angular information of light, a.k.a., plenoptic functions, to mimic the light from real objects, has gained increasing attention along with other VAC-mitigated technologies such as volumetric display, multi-focal-plane display, retinal scan display, and holographic display [3]. NE-LFDs can be implemented through different plenopticfunction-generating methods [4][5][6][7][8][9][10][11], e.g., microlens array (MLA), pinhole array, layered directional backlights, and hologram. With regard to the requirement of compactness in near-eye devices, among those methods, the MLA that enables integral imaging (InIm) brings about ultra-thin volume as well as high optical efficiency and very simple hardware for full color, compared with other VAC-mitigated display technologies.…”

“…With regard to the requirement of compactness in near-eye devices, among those methods, the MLA that enables integral imaging (InIm) brings about ultra-thin volume as well as high optical efficiency and very simple hardware for full color, compared with other VAC-mitigated display technologies. Thus, the MLA-based NE-LFD (NE-LFD for short in this paper) has been a research focus in these years [5][6][7][8][9][10][11]. Figure 1 shows the basic architecture of such a NE-LFD, where a 3D virtual image point is so generated that the chief rays emitted from several pixels in elemental images intersect at the image point in the virtual image space.…”

Image formation modeling and analysis of near‐eye light field displays

“…For example, the CDP of 1 D (yellow dots) can achieve a DOF of approximately 1 m to infinity, whereas suffering from low resolutions from 0.25 to 1 m. If the CDP of 4 D is used (blue dots), high resolutions can be achieved for very near images, but far images are unusable despite that the resolution decrease plateaus. If a full‐range DOF is needed, multiplexed CDPs are useful, which may be achieved through an electrically controlled LC MLA …”

Holographic Micromirror Array with Diffuse Areas for Accurate Calibration of 3D Light-Field Display

“…Light field display is one of the promising candidates that is expected to succeed as the next generation 3D display technology [1,2]. They can be used both as a head-mounted device [3,4] or as a head-up display [5,6]. Light field displays usually consist of a 2D display device (which displays integral images) combined with a microlens-array screen.…”