Volumetric display using a roof mirror grid array

Miyazaki, Daisuke; Hirano, Noboru; Maeda, Yoshinori; Ohno, Keisuke; Maekawa, Satoshi

doi:10.1117/12.840212

Cited by 13 publications

(6 citation statements)

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“…There are a various floating displays [1][2][3][4]. In this paper, we introduce two typical floating displays in retro-reflective types, respectively.…”

Section: Related Workmentioning

confidence: 99%

10‐1: Resolution Evaluation Using MTF for A High‐Definition Floating Display

Shimose,

Tamamura,

Tadauchi

et al. 2023

Symp Digest of Tech Papers

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In this paper, we propose a high‐definition floating display that places the proprietary design mirrors in a folding arrangement. There has been no uniform standard for evaluating floating displays. Therefore, we constructed an experimental environment matched to floating displays, and performed the evaluation using the Modulation Transfer Function, which is one of the indexes for evaluating lens performance. The evaluation result has shown that the proposed system achieved the floating display with almost the same resolution as the light source. It also has shown higher resolution than the conventional systems.

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“…There are a various floating displays [1][2][3][4]. In this paper, we introduce two typical floating displays in retro-reflective types, respectively.…”

Section: Related Workmentioning

confidence: 99%

10‐1: Resolution Evaluation Using MTF for A High‐Definition Floating Display

Shimose,

Tamamura,

Tadauchi

et al. 2023

Symp Digest of Tech Papers

View full text Add to dashboard Cite

show abstract

“…The optical component is composed of dihedral corner reflectors, which are manufactured by high precision techniques to provide a sharp image. Volumetric 3D display has been realized by use of his optical element [7]. Although we have realized several types of stereoscopic LED display by use of a large parallax barrier [8][9][10][11][12], floating LED signage has not realized yet.…”

Section: Introductionmentioning

confidence: 99%

Design of crossed-mirror array to form floating 3D LED signs

et al. 2012

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3D representation of digital signage improves its significance and rapid notification of important points. Our goal is to realize floating 3D LED signs. The problem is there is no sufficient device to form floating 3D images from LEDs. LED lamp size is around 1 cm including wiring and substrates. Such large pitch increases display size and sometimes spoils image quality. The purpose of this paper is to develop optical device to meet the three requirements and to demonstrate floating 3D arrays of LEDs. We analytically investigate image formation by a crossed mirror structure with aerial aperture, called CMA (crossed-mirror array). CMA contains dihedral corner reflectors at each aperture. After double reflection, light rays emitted from an LED will converge into the corresponding image point. We have fabricated CMA for 3D array of LEDs. One CMA unit contains 20 x 20 apertures that are located diagonally. Floating image of LEDs was formed in wide range of incident angle. The image size of focused beam agreed to the apparent aperture size. When LEDs were located three-dimensionally (LEDs in three depths), the focused distances were the same as the distance between the real LED and the CMA.

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“…So, several approaches have been researched to achieve the floating display based on the use of gradient-index lens array, 1 and lens array 2 and other optical elements. 3 Aerial display is the kind of floating display and implemented based on the half mirror and the retro-reflective film. 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.…”

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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Volumetric display using a roof mirror grid array

Cited by 13 publications

References 0 publications

10‐1: Resolution Evaluation Using MTF for A High‐Definition Floating Display

10‐1: Resolution Evaluation Using MTF for A High‐Definition Floating Display

Design of crossed-mirror array to form floating 3D LED signs

Volume-reduced floating display based on a holographic optical element

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