Three-dimensional see-through augmented-reality display system using a holographic micromirror array

Nyamsuren Darkhanbaatar; Munkh-Uchral Erdenebat; Chang-Won Shin; Ki-Chul Kwon; Kwon-Yeon Lee; Ganbat Baasantseren; Nam Kim

doi:10.1364/AO.428364

Applied Optics
Vol. 60,
Issue 25,
pp. 7545-7551
(2021)
•https://doi.org/10.1364/AO.428364

Three-dimensional see-through augmented-reality display system using a holographic micromirror array

Nyamsuren Darkhanbaatar, Munkh-Uchral Erdenebat, Chang-Won Shin, Ki-Chul Kwon, Kwon-Yeon Lee, Ganbat Baasantseren, and Nam Kim

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Nyamsuren Darkhanbaatar, Munkh-Uchral Erdenebat, Chang-Won Shin, Ki-Chul Kwon, Kwon-Yeon Lee, Ganbat Baasantseren, and Nam Kim, "Three-dimensional see-through augmented-reality display system using a holographic micromirror array," Appl. Opt. 60, 7545-7551 (2021)

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Abstract

It is difficult to find the micromirror array with desired specifications for augmented-reality displays, and the custom fabricating methods are complicated and unstable. We propose a novel, to our knowledge, three-dimensional see-through augmented-reality display system using the holographic micromirror array. Unlike the conventional holographic waveguide-type augmented-reality displays, the proposed system utilizes the holographic micromirror array as an in-coupler, without any additional elements. The holographic micromirror array is fabricated through the simple, effective, and stable method of applying the total internal reflection-based hologram recording using a dual-prism. The optical mirror and microlens array are set as references, and the specifications can be customized. It reconstructs a three-dimensional image from a displayed elemental image set without using any additional device, and the user can observe a three-dimensional virtual image while viewing the real-world objects. Thus, the principal advantages of the existing holographic waveguide-type augmented-reality system are retained. An optical experiment confirmed that the proposed system displays three-dimensional images exploiting the augmented-reality system simply and effectively.

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Optical Devices	Indices	Specifications
Laser source	Cobolt Samba 100	$λ = 532 n m$
Laser source	Cobolt Samba 100	Max Power = 100 mW
$4 f$ lens system	L1 = L2	Size: $45 \times 45 m m$
$4 f$ lens system	L1 = L2	$f_{L 1} = f_{L 2} = 200 m m$
Microlens array	Lens pitch	1 mm
	Focal length	$f_{L A} = 3.3 m m$
	Number of lenses	$150 \times 150$ lenses
Reference mirror	Flat mirror	$S i z e = 75 \times 75 m m$
Microdisplay	Resolution	$1024 \times 768 p x$
	Pixel pitch	0.0078 mm
	Size	$8 \times 6 m m$
Waveguide	Height	30 mm
	Width	70 mm
	Width
	Thickness	5 mm
	Thickness
Real objects and waveguide	Kitty	Height: 32 mm
Real objects and waveguide	Bolt	Height: 25 mm
Holographic material	Bayfol HX 102 Photopolymer	Thickness: $16.8 \pm 2 µ m$
Holographic material	Bayfol HX 102 Photopolymer	Exposure: $\sim 1 m W / c m^{2}$
Recorded HOE areas	In-coupler HMA	$12 \times 10 m m$ ( $12 \times 10$ micromirrors)
Recorded HOE areas	Out-coupler HOE	$12 \times 10 m m$
Camera	Sony α9000 DSLR	Resolution: $6000 \times 400 p x$
Camera	Sony α9000 DSLR	Pixel pitch: 0.006 µm

Abstract

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Applied Optics