Design of a large field-of-view see-through near to eye display with two geometrical waveguides

Yang, Jianming; Twardowski, Patrice; Gérard, P.; Fontaine, Joël

doi:10.1364/ol.41.005426

Cited by 36 publications

(12 citation statements)

References 19 publications

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“…In both MTF figures, the MTFs stay beyond 30% at 33 cycles/mm. They goes down to 10% at around 40 cycles/mm, which is sufficient for a visual system [5].…”

Section: Performance Of the Visormentioning

confidence: 95%

“…Reflection from a smooth surface cannot provide such arbitrary bending of light, which ultimately restricts the overall volume of HMD systems. Several designs have been reported in the literature to reach large FOV, including designs based on freeform optics [1-4], optical waveguides [5], reflective systems [6,7], and retinal scanning technology [8]. For example, Y. Zhu et al [6] designed an eight-mirror reversed telescope system to accomplish an ultra-thin near-eye device; D. Cheng et al [9] combined geometrical waveguides technology with freeform optics technology for the design of an ultra-thin near-eye display; J. Yang et al designed a see-through near-eye display using geometrical waveguides to accomplish a large FOV [5]; O. Cakmakci et al [1] proposed a freeform single-element head-worn display using a 289 term Gaussian radial basis function for representing a freeform optical surface as both a magnifier and reflector.…”

Section: Introductionmentioning

confidence: 99%

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Flat metaform near-eye visor

2017

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A near-eye visor is one of the most vital components in a head-mounted display. Currently, freeform optics and waveguides are used to design near-eye visors, but these structures are complex and their field of view is limited when the visor is placed near the eye. In this paper, we propose a flat, freeform near-eye visor which uses a subwavelength patterned metasurface reflector. The visor design imparts a spatial phase profile on a projected display pattern and can be implemented using a micron-scale thick metasurface. As the resulting metaform visor relies on diffraction, it can preserve a large field of view (77.3° both horizontally and vertically) when placed only 2.5 cm away from the eye. We simulate the metasurface visor to estimate the modulation transfer function, and find that the projected image quality is sufficiently high for human vision. While the design of the metasurface is initially performed via ray optics, using full-wave finite-difference time-domain simulation we validate a scaled version of our visor design.

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“…In both MTF figures, the MTFs stay beyond 30% at 33 cycles/mm. They goes down to 10% at around 40 cycles/mm, which is sufficient for a visual system [5].…”

Section: Performance Of the Visormentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Flat metaform near-eye visor

2017

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“…Optical see-through head mounted display is a key device for AR/VR applications attracting significant interest of major industrial players [1][2][3]. To realize a compact neareye display system, various technologies have been developed [4][5][6][7][8][9][10][11]. Currently most of the head mounted displays use the waveguide structure in order to reduce the overall size and weight of the device [1].…”

Section: Introductionmentioning

confidence: 99%

Metagrating solutions for full color single-plate waveguide combiner

Shramkova¹,

Drazic²,

Bourcin³

et al. 2022

EPJ Appl. Metamat.

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In this work we propose several full-color metagrating solutions for single waveguide-based Augmented and Virtual Reality near-eye display systems. The presented solutions are based on a combination of reflective and/or transmissive diffraction gratings inside or outside a waveguide. The proposed in-coupler designs have high diffraction efficiency across a wide angular range. Applying our new grating combination solution, we can provide good gathering of diffracted rays for the different colors. We demonstrate that by using a dual-mode symmetrical in-coupling system and angular pupil tiling, we can extend the overall horizontal FoV for three RGB colors. The new characteristics of the full single waveguide system including Eye Pupil Expander and out-coupling components compatible with the proposed in-coupling solutions are discussed. We show that a new nonsymmetrical design of metagratings can be used to change its diffraction properties improving the diffraction efficiency and diffraction uniformity of the optical components.

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“…A typical optical see-through HMD for AR applications minimally consists of a microdisplay, an eyepiece and an optical combiner, among which the optical combiner plays a critical role in determining the overall optical performance and system compactness of an AR displays. Several different technologies for constructing optical combiners have been developed, including a flat beamsplitter [1], a curved or freeform surface with a beamsplitter coating [2][3][4][5], a diffractive [6][7][8] or holographic waveguide [9][10][11][12][13], and a geometrical lightguide [14][15][16][17][18]. A flat beamsplitter is simple and low-cost, but its size scales up rapidly with the field of view (FOV) of a system and becomes impractical.…”

Section: Introductionmentioning

confidence: 99%