In this paper, we have investigated the floating image display with the computer-generated hologram (CGH).
As the 3D display, the floating 3D image gives strong dimensional impression to the viewer.
However, there are few reports about the floating image display by the CGH.
Since the required spatial frequency to the display is very high compared with the non-floating image display, it is difficult to output the CGH that displays the floating image.
If the CGH is output by the inadequate device, the viewing area and the image size of the CGH is not suitable for practical use.
Therefore, to reduce the required spatial frequency for the fringe pattern of the CGH, the position of the object is placed at the behind of the hologram plane.
Also, the huge calculation amount of the fringe pattern is big problem.
In our resent work, since we have developed our output device (named fringe printer) for the fringe pattern, the pixel pitch of the printed fringe pattern is improved from 0.87 μm to 0.44 μm.
By using the fringe printer, we have achieved to write over 100 Gpixel hologram.
Therefore, we investigate to make the floating image display with the fringe printer.
To realize the wider and larger image display, the image is reconstructed by the conjugate of the original reference wave to reproduce the real image.
Also, to solve the huge calculation amount, we employ the graphics processing unit to make calculation faster.