Improvement in image gaps and viewing angle of space-saving compact aerial display

Abstract

Two technologies for improving image gaps and narrow viewing angle were applied to a space-saving compact aerial display with striped retro-reflector on a LED panel. The aerial image gaps created by the striped retro-reflector structure was smoothed by scrolling the images perpendicular to the stripe direction. The narrow viewing angle inherent to the compact aerial display was successfully improved by increasing the width of the striped retro-reflector, verified by both theoretical calculation and measurement. These improvements in the space-saving compact aerial display would greatly expand its applications, such as digital signage and touchless interface.