Abstract
A new volumetric three-dimensional (3-D) display system that provides all the visual cues to depth perception has been developed. This system provides flicker-free, large 3-D images of 250 mm in both diameter and depth with a viewing cone from -10° to +10°. The system is simply composed of a dual-frequency liquid-crystal (LC) varifocal lens (the key device), a two-dimensional display, and two fixed lens. The focal length of the LC varifocal lens can be continuously varied from -1.2 to +1.5 diopters (1/m) by changing the effective refractive index of LC. Using a dual-frequency LC for the varifocal lens achieves sufficiently fast operation of at least 60 Hz for flicker-free moving 3-D images. The simple structure of our varifocal lens facilitates the fabrication of a large-diameter lens, resulting in large 3-D images with a sufficient viewing cone.
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