Aerial images are expected to be actively used in the entertainment field in the future,and various research is being conducted to achieve this. Electro-holography shows promise for displaying high-quality aerial images in the future,but the disadvantage is that the viewing zone, which is the range where the observer can observe the reconstructed image,is narrow. The viewing zone of an electro-holography is determined by the pixel pitch of the display device (e.g.,a liquid crystal display). The smaller the pixel pitch, the larger the viewing zone, so it makes sense that a higher performing display device would be the best way to solve this problem. However, the pixel pitch of the currently used display devices are not sufficiently small, and significant improvements in performance are not likely.In this work, we propose a tabletop optical system utilizing a CGH calculation method based on Fourier transform holographic calculation that expands the viewing zone of an electronic holography regardless of the performance of the display device. The proposed optical system can display an aerial image with a wider viewing zone when the size of the display device is larger, so even a current display device can reproduce an aerial image with a wider viewing zone.
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