29 March 1996 Liquid crystal projection image depixelization by spatial phase scrambling
Author Affiliations +
Proceedings Volume 2650, Projection Displays II; (1996); doi: 10.1117/12.236999
Event: Electronic Imaging: Science and Technology, 1996, San Jose, CA, United States
Abstract
A technique to remove the pixel structure by randomly scrambling the relative phase among the multiple spatial spectra is described. Due to the pixel structure of the liquid crystal display panel, multiple spectra are generated at the Fourier spectrum plane (usually at the back focal plane of the imaging lens). A transparent phase mask is placed at the Fourier spectrum plane such that each spectral order is modulated by one of the subareas of the phase mask. The thickness of these phase mask subareas are randomly assigned and the phase delay resulted from each pair of subareas is longer than the coherent length of the light source, which is about one micron for white light. Such a phase scrambling eliminates the coherence between different spectral orders, therefore, the reconstructed images from the multiple spectra will superimpose incoherently and the pixel structure will not be observed in the projection image.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xiangyang Yang, Nan Li, Suganda Jutamulia, "Liquid crystal projection image depixelization by spatial phase scrambling", Proc. SPIE 2650, Projection Displays II, (29 March 1996); doi: 10.1117/12.236999; https://doi.org/10.1117/12.236999
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KEYWORDS
LCDs

Optical filters

Light sources

Liquid crystals

Projection systems

Transparency

Collimation

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