Compact see-through 3D head-mounted display based on wavefront modulation with holographic grating filter

Abstract

A compact see-through three-dimensional head-mounted display (3D-HMD) is proposed and investigated in this paper. Two phase holograms are analytically extracted from the object wavefront and uploaded on different zones of the spatial light modulator (SLM). A holographic grating is further used as the frequency filter to couple the separated holograms together for wavefront modulation. The developed preliminary prototype has a simple optical facility and a compact structure (133.8mm × 40.4mm × 35.4mm with a 47.7mm length viewing accessory). Optical experiments demonstrated that the proposed system can present 3D images to the human eye with full depth cues. Therefore, it is free of the accommodation-vergence conflict and visual fatigue problem. The dynamic display ability is also tested in the experiments, which provides a promising potential for the true 3D interactive display.

Holographic display technology based on liquid crystal device

“…In recent years, researchers have developed a new device with blue‐phase LC (BPLC) for phase‐only modulation based on an LCoS, which allows a laser beam to traverse the BPLC layer four times and helps suppress the fringing field effect of a high‐resolution LCoS, as shown in Figure . Besides, submillisecond response LCoS has been proposed and the BPLC with submillisecond response for reflective SLM has also been proposed to meet the requirement of holographic display, and the holographic display with large viewing angle has been proposed by using the electrolyte LCoS with the pixel size of 1 μm …”

“…Besides, submillisecond response LCoS has been proposed and the BPLC with submillisecond response for reflective SLM has also been proposed to meet the requirement of holographic display, 37,38 and the holographic display with large viewing angle has been proposed by using the electrolyte LCoS with the pixel size of 1 μm. 39,40 When a single SLM is used in the holographic display system, the viewing angle is very small. In 2002, a viewing-zone enlargement method was proposed by using high-order diffraction light.…”

Review of real-time reconstruction techniques for aerial-projection holographic displays

“…To avoid the issue, head-mounted or near-eye holographic displays have been researched. 86,[90][91][92][93][94] A near-eye display does not require large SLMs; the SLMs only need to cover the field of view of a human eye. Since the view point is fixed in the near-eye display, a large viewing angle is not needed.…”

P‐36: Design of Simulation Tools for Light‐field Near‐eye Displays with a Pinhole Array

“…Researchers have recently proposed various approaches [2][3][4][5][6][7] to solve such problem by combining volumetric, holographic or light-field techniques with near-eye displays. Within these methods, light-field near-eye displays are the most promising solution considering the amount of data input and the characteristics of human visual system.…”