Lensless phase-only holographic retinal projection display based on the error diffusion algorithm

Wang, Zi; Tu, Kefeng; Pang, Yujian; Xu, Miao; Lv, Guoqiang; Feng, Qibin; Wang, Anting; Ming, Hai

doi:10.1364/oe.477816

Cited by 12 publications

(4 citation statements)

References 31 publications

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“…In this experiment, we used spherical waves instead of the traditional random phase. Speckle is usually caused by an increase in the random phase, and this approach results in the better suppression of speckle and noise as well [ 28 ].…”

Section: Conventional Holographic Smv Maxwellian Display With Limited...mentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Wang,

Su,

Pang

et al. 2023

Micromachines

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A super multi-view (SMV) near-eye display (NED) effectively provides depth cues for three-dimensional (3D) display by projecting multiple viewpoint or parallax images onto the retina simultaneously. Previous SMV NED have suffered from a limited depth of field (DOF) due to a fixed image plane. In this paper, a holographic SMV Maxwellian display based on depth segmentation is proposed to enhance the DOF. The proposed approach involves capturing a set of parallax images and their corresponding depth maps. According to the depth maps, the parallax images are segmented into N sub-parallax images at different depth ranges. These sub-parallax images are then projected onto N image-recording planes (IRPs) of the corresponding depth for hologram computation. The wavefront at each IRP is calculated by multiplying the sub-parallax images with the corresponding spherical wave phases. Then, they are propagated to the hologram plane and added together to form a DOF-enhanced hologram. The simulation and experimental results are obtained to validate the effectiveness of the proposed method in extending the DOF of the holographic SMV displays, while accurately preserving occlusion.

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Section: Conventional Holographic Smv Maxwellian Display With Limited...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Wang,

Su,

Pang

et al. 2023

Micromachines

Self Cite

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show abstract

“…The pin-mirror-based technology has the advantage of being able to implement a compact optical system and expand the eye-box, but the use of the pin-mirror array also has the opposite effect of reducing the DOF expansion effect. In addition, HOE technology 38 and DOF extension technology applying holographic retinal projection 39 – 42 have been studied. These technologies showed the possibility of being applied as commercialized technologies when holographic display or HOE technology matures in the future.…”

Section: Introductionmentioning

confidence: 99%

Extended depth of field in augmented reality

Kim

Kwon

Yoon

2023

Sci Rep

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The 3D display device shows an image with depth information. Conventional 3D display devices based on binocular parallax can focus accurately only on the depth of a specific screen. Because the human eye has a narrow depth of field (DOF) under normal circumstances, 3D displays that provide a relatively wide range of virtual depth areas have limitations on the DOF where clear 3D images are seen. To resolve this problem, it is necessary to find the optical conditions to extend the DOF and analyze the phenomena related to it. For this, by using the Rayleigh criterion and the Strehl ratio, a criterion for this extension of the DOF is suggested. A practical optical structure that can effectively extend the DOF is devised using a flat panel display. This optical structure could be applied to AR, VR, and MR in the field of near-eye displays. From the results of this research, the fundamental optical conditions and standards are proposed for 3D displays that will provide 3D images with extended DOF in the future. Furthermore, it is also expected that these conditions and criteria can be applied to optical designs for the required performance in the development of 3D displays in various fields.

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“…However, the matched video sources are still hard to access or generate for commercial use due to the large amount of 3D data. Apart from these, the Maxwellian NED is less computationally expensive and relieves the VAC problem by providing an “always in-focus” image, but the monocular depth cues are not recovered [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Depth-Enhanced Holographic Super Multi-View Maxwellian Display Based on Variable Filter Aperture

Chen

Wang

et al. 2023

Micromachines

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The super multi-view (SMV) near-eye display (NED) effectively provides depth cues for three-dimensional (3D) displays by projecting multiple viewpoint images or parallax images onto the retina simultaneously. Previous SMV NED suffers from a limited depth of field (DOF) due to the fixed image plane. Aperture filtering is widely used to enhance the DOF; however, an invariably sized aperture may have opposite effects on objects with different reconstruction depths. In this paper, a holographic SMV display based on the variable filter aperture is proposed to enhance the DOF. In parallax image acquisition, multiple groups of parallax images, each group recording a part of the 3D scene on a fixed depth range, are captured first. In the hologram calculation, each group of wavefronts at the image recording plane (IRP) is calculated by multiplying the parallax images with the corresponding spherical wave phase. Then, they are propagated to the pupil plane and multiplied by the corresponding aperture filter function. The size of the filter aperture is variable which is determined by the depth of the object. Finally, the complex amplitudes at the pupil plane are back-propagated to the holographic plane and added together to form the DOF-enhanced hologram. Simulation and experimental results verify the proposed method could improve the DOF of holographic SMV display, which will contribute to the application of 3D NED.

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Lensless phase-only holographic retinal projection display based on the error diffusion algorithm

Cited by 12 publications

References 31 publications

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

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

Extended depth of field in augmented reality

Depth-Enhanced Holographic Super Multi-View Maxwellian Display Based on Variable Filter Aperture

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