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Proceedings Paper

Contrast ratio of vertically aligned nematic cell
Author(s): David Armitage
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Paper Abstract

The vertical aligned nematic cell is favored in reflective projector systems because of its inherent high contrast ratio, which is essentially independent of cell gap variation and wavelength. Off-axis projectors are of commercial interest due to lower manufacturing cost. A computational study of projector contrast ratio as a function of projection f/number and offset angle is presented. The off-axis system maintains a contrast ratio greater than 100 up to offset angles of 15-degrees. Modest compensation with a negative uniaxial retarder allows the off-axis projector to reach contrast ratios comparable with on-axis systems.

Paper Details

Date Published: 25 April 2000
PDF: 9 pages
Proc. SPIE 3954, Projection Displays 2000: Sixth in a Series, (25 April 2000); doi: 10.1117/12.383377
Show Author Affiliations
David Armitage, Consultant (United States)

Published in SPIE Proceedings Vol. 3954:
Projection Displays 2000: Sixth in a Series
Ming Hsien Wu, Editor(s)

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