Enlarging the FOV of lensless holographic retinal projection display with two-step Fresnel diffraction

Abstract

The field of view (FOV) of holographic retinal projection display (RPD) is always restricted by the diffraction angle of a spatial light modulator (SLM). In this paper, we demonstrate a large FOV holographic RPD by using two-step Fresnel diffraction calculation. By adding the pupil plane as the intermediate plane and decreasing the sampling interval, the FOV can be enlarged to nearly two times of the diffraction angle limit without any physical change. Due to the added spherical wave phase, the influence of aliasing is eliminated because the adjacent orders are projected to different viewpoints. The nonuniform image intensity caused by the sinc function modulation is compensated by image pre-processing. Optical experiments verify that the proposed method can present a uniform holographic near-eye display with a large FOV and adjustable viewpoint position.

Field of View Enhancement of Dynamic Holographic Displays Using Algorithms, Devices, and Systems: A Review

“…So, it is economically inefficient, and optical configuration also becomes complex due to the use of three SLMs. The two-step Fresnel diffraction method [11] for CGH calculation is formulated for expansion of FOV without any physical change in the optical setup. The virtual image size is increased, resulting in enhanced FOV, by decreasing the sampling interval on the intermediate plane.…”

P‐4.16: Extending Eyebox with Big FOV for Holographic Retinal Projection Display

“…In ref (18), they propose a large FOV holographic Maxwellian display based on spherical crown diffraction. In ref (19), the two-step Fresnel diffraction calculation method for expanding the FOV has been proposed. But there is no better solution to achieve large FOV and eyebox at the same time.…”

A Depth-Enhanced Holographic Super Multi-View Display Based on Depth Segmentation

“…While these methods provide good results, they are limited by the limited range of video sources and they are not very efficient. The Maxwellian display [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ] partially alleviates the VAC problem by increasing the depth of field. However, it is unable provide accurate depth cues for monocular vision.…”