Herein, we propose a volumetric 3D display in which cross-sectional images are projected onto a rotating helix screen. The method employed by this display can enable image observation from universal directions. A major challenge associated with this method is the presence of invisible regions that occur depending on the observation angle. This study aimed to fabricate a mirror-image helix screen with two helical surfaces coaxially arranged in a plane-symmetrical configuration. The visible region was actually measured to be larger than the visible region of the conventional helix screen. We confirmed that the improved visible region was almost independent of the observation angle and that the visible region was almost equally wide on both the left and right sides of the rotation axis.

We have proposed and developed e-Tile for wall decoration and ornaments for interior/exterior. A prototype of 2m×2m large energy-saving reflective panel was realized by arraying 400 e-Tiles on a flat plane. Prototypes of cubic displays were also realized by constructing e-Tiles to cubic shape. Artistic display effects and 3D impression could be found in these cubic prototypes. We hope e-Tile is a promising solution to extend the application field of e-Paper to decorative use including architectural applications.