Formation of multiple aerial LED signs in multiple lanes formed with AIRR by use of two beam splitters

Abstract

We propose multiple aerial imaging system by use of two beam splitters in the optical system of aerial imaging by retro-reflection (AIRR). The AIRR optical system consists of a light source, a beam splitter, and a retro-reflector. Use of two-layered beam splitters enables us to show multiple aerial signs to drivers in multiple driving lanes. The purpose of this paper is to confirm feasibility that an aerial display by use of AIRR for a novel traffic information provision. First, we explain an optical configuration to show aerial images to multiple road lanes, a driving lane and an overtaking lane with AIRR by use of two beam splitters. Next, we have developed a prototype optical system by use of two large beam splitters and a large high-brightness LED sign that is designed to be used for actual road displays. The light source was an LED display with a height of 450 mm and a width of 390 mm, which shows a character. We observed aerial images by naked eyes as experiments. And we discuss the issues for practical application that the experiments have revealed.

Aerial display that reconstructs face orientation by use of spatial blending of two face images

“…An AIRR system can form aerial images and has three advantages: the image is recognizable to the naked eye and low cost, and the system has a wide viewing angle. Various AIRR‐based applications have been proposed that take advantage of these characteristics, for example, an aerial video‐calling system with eye‐matching feature, 13 an immersive aerial interface that allows users to interact with contents on the aerial display, 14 multiple aerial imaging using parallel half mirror and mirror, 15 aerial display to multiple road lanes for providing new traffic information provision, 16 aerial depth‐fused 3D (DFD) display to give depth information, 17 aerial display based on an LED panel covered with apertured retro‐reflector forming an aerial image in the direction of the LED panel, 18 subjective super‐resolution aerial display to improve the apparent resolution of the aerial image by switching multiple adjacent subframes at high speed, 19 and a triple‐view display showing different aerial images to observers at different view positions by the combining several AIRR optics 20 . Furthermore, we have demonstrated AIRR optical systems that form a real image in water 21 and omnidirectional aerial display for behavioral biology experiments 22 .…”

Reconstruction of aerial image just around viewing eyes for ultra-wide field-of-view display

“…Recently, an immersive life-size aerial display based on AIRR has increased the space between the aerial image and the hardware, which is equipped with motion capture and enables interactive display [9][10][11] and the use of Fresnel lenses to increase the floating distance [12]. This immersive aerial display has no need to pay much attention for closing or moving beyond aerial images, because this can provide large pop-up distance of aerial image and no hardware around aerial image.…”