P‐3.22: One‐way Observable Aero Signage Display Using Optical Prisms Doped with Dye and Pigments Which Enable to Make Transparent from Back Side

Abstract

Suppose that you look Arabic numerals on transparent glass windows or in the air. Which does it mean ‘85’ or ‘28’? You end up watching the mirrored images when you view from back side. So let us make the mirrored image invisible. This paper shows a one-way observable display for aero signage whose images are floating in the air. To solve mirrored image problems of an aero signage, our research group has utilized dye-doped prisms and total internal reflection in optics. You know that water is generally colorless and transparent but the water in a bath tub is little blue. The color changes depending on the depth of water. The deeper, the darker water becomes blue. This is the reason why some color is generated in the dye-doped material. In 2021, we presented a one-way observable display using letterings made by intaglio printings for arranging dye-doped tiny prisms on a glass window. You can watch these colored letterforms from front and transparent pixels from back. But this 2021 model has a little defect that colors are less vivid because of color generating mechanism using transparent materials for one-way observing. In this paper, the authors show special designed optical prisms which are doped with dye and pigments to avoid the semitransparent problem that means colors are not vivid.