In this paper, we present a novel three-dimensional (3D) sensing system which can demonstrate 3D acquisition. The
proposed system is using an electronically tunable liquid crystal (LC) lens with axially distributed sensing method.
Therefore, multiple 2D images with slightly different perspectives by varying the focal lengths of the LC lens without
mechanical movements of an image sensor can be recorded. And then the 3D images are further reconstructed according
to the ray-back projection algorithm. The preliminary functionalities are also demonstrated in this paper. We believe that
our proposed system may useful for a compact 3D sensing camera system.
The liquid crystal lenses system, which could be electrically controlled easily for autostereoscopic 2D/3D switchable
display was proposed. The High-Resistance liquid crystal (HRLC) lens utilized less controlled electrodes and coated a
high-resistance layer between the controlled-electrodes was proposed and was used in this paper. Compare with the
traditional LC lens, the HR-LC Lens could provide smooth electric-potential distribution within the LC layer under
driving status. Hence, the proposed HR-LC Lens had less circuit complexity, low driving voltage, and good optical
performance also could be obtained. In addition, combining with the proposed driving method called dual-directional
overdriving method, the above method could reduce the switching time by applying large voltage onto cell.
Consequently, the total switching time could be further reduced to around 2second. It is believed that the LC lens system
has high potential in the future.
KEYWORDS: Liquid crystals, Electrodes, Switching, 3D displays, 3D image processing, Fresnel lenses, Fast packet switching, Autostereoscopic displays, LCDs, Refractive index
The fast response Fresnel liquid crystal lens with multiple electrodes structure had been proposed and optimized. The
multi electrodes in the new Fresnel LC lens were placed at both inner surfaces of LC cell. By supplying specific
operating voltages on each electrode, the optimized Fresnel LC lens was closed to the ideal Fresnel lens. The experiment
results indicated that the Fresnel LC lens not only performed fast switching rate without over-drive method, but also had
the advantage of low operating voltage. Furthermore, by using overdriving method, the response time could be further
reduced but just need 15volts in a short time. It meant that a fast switching between 2D and 3D image display could be
obtained by switching Fresnel LC lens on and off. In the end, the fast switching display was also demonstrated.
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