Abstract
Modern Pepper's ghost—“floating hologram”—systems generally use transparent screens called half mirrors or foils. this system must have the same screen size as the image size in order to display a large-sized image. Further, depth of the image can only be obtained from the distance between the screen and the display panel. These limitations can be overcome using holographic optical elements (HOE). HOE is made by recording as a refractive force of the lens with holographic material. In this study, the numerical values of the reconstructed images were theoretically analyzed through optical ray tracing, and the theoretical design of the reconstructed image size and depth plane was numerically measured and experimentally verified.
Highlights
There are several 3D displays that their developers claim to be “holographic” [1]
holographic optical elements (HOE) calculates the maximum angle of diffusion in an optical diffuser and has the size that all diffused rays can be inputted into HOE
Ld is the length of a single axis of the 2D projection image that is imaged on an optical diffuser. ddh is the distance from the optical diffuser to the HOE. doh is the distance from the observer’s eye-box to HOE, and dvh represents the distance from HOE to augmented virtual image
Summary
There are several 3D displays that their developers claim to be “holographic” [1]. In particular the modern versions of the Pepper’s ghost illusion—invented by the English scientist John Henry Pepper in 1862—are often call “floating holograms” by the general public and the media. Pepper’s ghost technique displays 2D images on the reflector to create the effect of floating virtual 3D images for the viewers [2,3,4]. The system typically uses transparent screens called half mirrors or foils as a way to project 2D images in the space. This system has a 1:1 ratio of the size of input and output images, and the depth takes place near the screen. Do represents the object distance, di represents the image distance, and f represents the focal distance of the lens [10,11,12]
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