A plastic holographic waveguide combiner for light‐weight and highly‐transparent augmented reality glasses

Yoshida, Toshiomi; Tokuyama, Kazutatsu; Yuichi, Takai; Tsukuda, Daisuke; Kaneko, Tsuyoshi; Suzuki, Nobuhiro; Anzai, Takafumi; Yoshikaie, Akira; Akutsu, Katsuyuki; Machida, Akio

doi:10.1002/jsid.659

Cited by 33 publications

(27 citation statements)

References 7 publications

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“…Although the user could recognize both environment and the HMD image in both cases, the compatibility of large field of view (FoV), see‐through property, and small‐size optics is not achievable. To achieve the compatibility, we selected the waveguide method in which image light is transmitted within the waveguide by total internal reflection (TIR) 17–19 …”

Section: Design Of Waveguidementioning

confidence: 99%

High luminance and high see‐through head‐mounted displays with beam‐splitter‐array waveguides

et al. 2020

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We have developed head‐mounted displays with high transmittance and luminance, which could be utilized outside safely without dimming glasses. We first specified required optical performance specifications by considering user's safety and usability. In order to ensure that the user is able to recognize both surrounding environment and the image of the head‐mounted display, we set the target specification that the transmittance is higher than or equal to 85%, and the luminance contrast ratio is larger than or equal to 1.15 with display image of white solid pattern. We then developed the beam‐splitter‐array waveguide to achieve the requirements. It has advantages in high efficiency and high see‐through property. In order to determine configuration of the waveguide, we have performed optical ray trace simulation. We also established versatile waveguide measurement method applicable to different‐type waveguides. By utilizing the waveguide we have developed, we made a prototype of a head‐mounted display (HMD) with high transmittance 94% and high luminance 4.8 × 103 cd/m2 and thus luminance contrast ratio 1.25 under the sun. With these advantages, our HMD is suitable for usage outside including applications of work support systems where dimming effect is not preferred, and the HMD is used under the sun.

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Section: Design Of Waveguidementioning

confidence: 99%

High luminance and high see‐through head‐mounted displays with beam‐splitter‐array waveguides

et al. 2020

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“…We used full color AR glasses with hologram wave guide [6] and the ECD to confirm the effect of the visibility improvement. The ECD was attached outside of hologram wave guide so that it can change the brightness of the background of the virtual image.…”

Section: Fig7 Optical Properties After Long-term Reliability Test Unmentioning

confidence: 99%

79‐4: A Plastic Electrochromic Dimming Device for Augmented Reality Glasses

Machida

Kadono

Ishii

et al. 2018

Symp Digest of Tech Papers

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“…See-through near-to-eye displays (NEDs), which are core components of the augmented reality (AR) headsets, have been given considerable attention recently [1,2]. Various optical technologies have been actively studied for the see-through AR NEDs, such as the free-form optics [3], the direct retinal projection optics [4,5], and the waveguide optics [6][7][8][9][10][11][12][13][14][15]. Among these technologies, the waveguide optics provide the best way to minimize the size of NEDs, which is crucial for the comfort and compactness of the AR headsets.…”

Section: Introductionmentioning

confidence: 99%

“…Among these technologies, the waveguide optics provide the best way to minimize the size of NEDs, which is crucial for the comfort and compactness of the AR headsets. Waveguide technologies can be categorized into three groups according to the types of couplers: geometric waveguides with the reflective couplers [6][7][8], the diffractive waveguide with the surface relief grating couplers [9], and the holographic waveguide with the holographic optical element (HOE) couplers [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The vergence-accommodation conflict (VAC), which represents a mismatch between the vergence distance and focal distance of human eye [16], may lead to visual discomfort, eye fatigue, and nausea. Unfortunately, for holographic waveguides, most studies have focused on presenting the virtual images at optical infinity [10][11][12], which causes the VAC problem. In this case, the waveguide structure and HOEs are optimized for the collimated light source.…”

Section: Introductionmentioning

confidence: 99%

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Crosstalk Reduction in Voxels for a See-Through Holographic Waveguide by Using Integral Imaging with Compensated Elemental Images

2021

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The representation of three-dimensional volumetric pixels, voxels, is an important issue for the near-to-eye displays (NEDs) to solve the vergence-accommodation conflict problem. Although the holographic waveguides using holographic optical element (HOE) couplers are promising technologies for NEDs with the ultra-thin structure and high transparency, most of them have presented only a single and fixed depth plane. In this paper, we analyze the imaging characteristics of holographic waveguides, particularly to represent the arbitrary voxels and investigate the voxel duplication problem arising from the non-collimated light from the voxels. In order to prevent the image crosstalk arising from the voxel duplication, we propose an adjustment method for the emission angle profile of voxels by using the integral imaging technique. In the proposed method, the sub-regions of elemental images, which correspond to the duplicated voxels, are masked in order to optimize the emission angle of integrated voxels. In the experimental verification, a see-through integral imaging system, based on the organic light-emitting diode display and a holographic waveguide with the thickness of 5 mm, was constructed. The fabricated HOE in the waveguide showed high diffraction efficiency of 72.8 %, 76.6%, and 72.5 % for 460 nm, 532 nm, and 640 nm lasers, respectively. By applying the masked elemental images, the proposed method resulted in a reduced crosstalk in the observed voxels by 2.35 times. The full-color experimental results of see-through holographic waveguide with integral imaging are provided, whereby the observed 3D images are presented clearly without the ghost images due to the voxel duplication problem.

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A plastic holographic waveguide combiner for light‐weight and highly‐transparent augmented reality glasses

Cited by 33 publications

References 7 publications

High luminance and high see‐through head‐mounted displays with beam‐splitter‐array waveguides

High luminance and high see‐through head‐mounted displays with beam‐splitter‐array waveguides

79‐4: A Plastic Electrochromic Dimming Device for Augmented Reality Glasses

Crosstalk Reduction in Voxels for a See-Through Holographic Waveguide by Using Integral Imaging with Compensated Elemental Images

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