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Title: Projection optics and liquid crystal based active waveguides for flat-panel 3D displays
Author: Chen, C.-H.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2000
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Three-dimensional displays provide a sensation of physical depth and have demonstrated their functional effectiveness in several task or leisure-oriented applications. However, their relatively poor performance and high cost compared to present two-dimensional displays largely reduce users' interest to go for this further dimension in image presentation. The main theme of this research is to upgrade the quality of 3D video image to the state-of-the-art 2D image standard while keeping the cost low by a better embodiment of existing 3D architectures. The multi-projector autostereoscopic display has been chosen for further development due to the flexibility of field-of-view and screen size to be improved with available technologies. The problem of dark areas in the viewing space has firstly been solved by a novel projection lens array with the lenses' exit pupils abutting. Further improvements have been made by introducing planarisation techniques and unconventional imaging optics. The proposed configuration is comprised of a waveguide screen with a one-dimensional liquid crystal based switchable element array and a projection optical system featuring a circularly symmetric field lens, a diffuser and collimated image sources. The device has a thickness equal to the height of only one line and ensures a field-of-view up to 60o. The prototype of the optical system has been tested for image quality, which shows that good quality can be achieved by simple and low cost optics. A test on the cross-view effect has also demonstrated that a perfect autostereoscopic 3D image can be rendered with careful alignment. On the other hand, the analysis and test of liquid crystal grating cells have shown that this device will be adequate as the switchable element embedded in a waveguide screen to perform line-multiplexing and light deflection for 3D applications, but modification is required if efficiency and contrast ratio are to be improved.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available