We have realized a novel optical system to form a large aerial image in front of a full-color LED panel that is covered with retro-reflector. The retro-reflector has square apertures through which lights from the LED pixels pass. Our optical system is based on aerial imaging by retro-reflection (AIRR). The aerial image formed with AIRR is visible over a wide viewing angle without using 3D glasses. To reduce the system volume, a beam splitter is placed parallelly in front of the LED panel covered with the retro-reflector. Because the apertured retro-reflector is placed on the LED panel, no moiré occurs between the apertures in the retro-reflector and black regions on the LED panel. We have analytically clarified the optimal aperture ratio in the proposed optical system to increase the luminance of the aerial image. Furthermore, we have developed a prototype for experimental confirmation of our optical system and measured of the luminance intensity of the aerial images. Consequently, we have confirmed measured results are consistent with our analysis. Showing aerial signage in front of an LED panel reduces the foot space, which is suitable for the installation of a large-scale aerial display for advertisement and exhibitions.

我们已经实现了一种新颖的光学系统，可以在覆盖有后向反射器的全色LED面板的前面形成较大的航拍图像。后向反射器具有方形孔，来自LED像素的光穿过该孔。我们的光学系统基于通过后向反射（AIRR）进行的空中成像。在不使用3D眼镜的情况下，可以在宽视角范围内看到由AIRR形成的航空图像。为了减小系统体积，将分束器平行放置在覆盖有后向反射器的LED面板的前面。由于带孔的后向反射器放置在LED面板上，因此在后向反射器中的孔与LED面板上的黑色区域之间不会出现波纹。我们已经分析地阐明了所提出的光学系统中的最佳孔径比，以提高航拍图像的亮度。此外，我们已经开发出一个原型，用于光学系统的实验确认并测量了航空影像的亮度。因此，我们已经确认测量结果与我们的分析一致。在LED面板的前面显示空中标牌可以减少脚部空间，适合安装用于广告和展览的大型空中显示器。