We present a new method to render aerial images using the retroreflective particles. Transmissive particles coded by reflective films on half-side behave as retroreflective material. In our method, we place the retroreflective particles in the air. Falling retroreflective particles play a role as a diffuser like a fog screen. Owing to the properties of the retroreflective material, it is possible to place the projector in the same direction as the observer with respect to the screen. This has an advantage that the image can be observed without facing the light source. Light incident on the retroreflective material comes back to the observer without scattering. This makes it possible to project images with high brightness. By passing the incident light through a plurality of retroreflective particles facing various directions in the air, our display enables to have a wide viewing angle. The result showed that when the 60 degree angle was shifted from the position showing the highest luminance, the luminance at that angle was about 54% of the highest luminance. In addition to the wide viewing angle, the particle size enables the images on this display to be sharp.
Shinnosuke Ando, Kazuki Otao, Kazuki Takazawa, Yusuke Tanemura, and Yoichi Ohiai
University of Tsukuba, Pixie Dust Technologies, Inc.
安藤真之介, 大峠和基, 高澤和希,種村優佑, 落合陽一