High-efficiency aerial display using a liquid crystal polarization grating, a retroreflector array, and a right-angle prism

Sakamoto, Moritsugu; Yamada, Koya; Momosaki, Ryusei; Noda, Kohei; Sasaki, Tomoyuki; Kawatsuki, Nobuhiro; Tanaka, Yuko; Sakai, Takeya; Hattori, Yukitoshi; Ono, Hiroshi

doi:10.1364/ao.390629

Cited by 9 publications

(2 citation statements)

References 21 publications

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“…In contrast to other mechanical deflection devices, a Liquid Crystal Polarization Grating (LCPG) is a device that introduces a continuous gradient tilt phase distribution based on the geometric phase to produce beam deflection [1,2]. It has the advantages of being tiny, light, and having low power consumption.…”

Section: Introductionmentioning

confidence: 99%

Optimal Control of Passive Cascaded Liquid Crystal Polarization Gratings

et al. 2023

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The incidence angle of a beam entering a liquid crystal variable retarder (LCVR) and the liquid crystal polarization grating (LCPG) is greater when the LCPG is utilized in the quadrature cascade, which reduces the diffraction efficiency. Therefore, this study investigates the best method for controlling a cascaded LCPG. By optimizing the control coefficient and the method for controlling the voltage of the LCVR, this study reduces the angle between the incident LCVR and the polarization grating, and increases the diffraction efficiency of the grating. It was confirmed that this strategy can increase the diffraction effectiveness of the quadrature cascaded LCPG through the design of the experimental setup.

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Section: Introductionmentioning

confidence: 99%

Optimal Control of Passive Cascaded Liquid Crystal Polarization Gratings

et al. 2023

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“…5 Since the aerial display can provide a floating image to the viewer based on the simple structure, various approaches for the develpment have been proposed. [6][7][8] However, a critical problem of the aerial display is that the volume is huge because the angle of the half mirror is at 45 degrees.…”

Section: Introductionmentioning

confidence: 99%

Volume-reduced floating display based on a holographic optical element

Choi

Kim

Kang

et al. 2022

Holography, Diffractive Optics, and Applications XII

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In this paper, we propose a volume-reduced floating display based on a holographic optical element (HOE). The critical problem of a conventional floating display is a huge size, and this drawback limits its practical application. To overcome this drawback, the proposed floating display used the HOE for a reduction of the volume instead of a half mirror. Generally, the HOE can control the diffraction angle of the propagating wavefield. Also, the suitable HOE can be designed depending on the structure or a requirement of the floating display. So, the volume of the proposed floating display can be reduced through the HOE when the HOE is designed to reduce the diffraction angle. In the proposed floating display, the HOE is inclined at a certain angle in front of the retroreflective film. And, the projector and diffuser are set up the bottom of the inclined HOE. Wavefields propagated from the projector are formed as an image on the diffuser and, diffracted by the HOE into the retroreflective film. These diffracted wavefields are reflected by the retroreflective film back toward the direction of the propagating wavefields. As a result, the floated image is formed in the real space. For the optical experiment, we designed a HOE and set up the proposed floating display. Experimental result shows that the image is formed in real space like the conventional floating display. Also, we confirm that the volume of the floating display is reduced by as much as 35.6 % compared with the conventional floating display.

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