Liquid-crystal based Image Steering Components with Low Distortion
Date Issued
2012
Date
2012
Author(s)
Tsai, Meng-Ko
Abstract
A liquid-crystal (LC) based beam steering device for a super-multi-view auto-stereoscopic display has been successfully designed and simulated. The steering range of the device is around 36 degree (full-angle) and the average beam divergence is 0.155 degree. The beam steering device is composed of two sub parts. The first one is a LC-based grating based on the law of refraction and the characteristic of a birefringent material. The period of the grating is 0.1mm and the angle of the small prism is 25 degree. The second one is an angular magnification device with three aspherical lenses. In order to keep the displayed image undistorted, we want the steered beam to keep its collimation. We simulated with the Kepler, the Galilean and the modified Kepler telescopic configuration and adopted the modified Kepler one due to the minimum divergence of the transmitted beam. We then optimized the configuration with aspherical surfaces and the optimization successfully decreases the image distortion. The possibility to accomplish realistic 3-D image (super-multi-view) was also confirmed with the images simulation. The beam steering concept was experimentally verified but was no success due to a manufacturing problem. Feedbacks on simulation and fabrication as well as the future perspectives are given in the end of this thesis.
Subjects
Beam Steering
Liquid Crystal
Auto-stereoscopic Display
Super-multi-view
Low Distortion
Type
thesis
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