Abstract
We show how the phase modulation depth in twisted nematic liquid crystal displays
(TNLCDs) can be increased dramatically by selecting a polarization configuration
with a reduced mean intensity transmission. This phenomenon, which we have validated
with various devices, is shown here for a device that presents a phase-only
modulation only slightly over π radians in our classical rotated eigenvector configuration, but it is
capable of producing close to a phase depth for a configuration with 5% mean intensity transmission. A
quantitative explanation is presented by means of a phasor analysis of the TNLCD
eigenvector projections over input and output polarization states. The proposed
technique can be a very useful solution in modern TNLCDs that have a very thin
liquid crystal layer and a reduced maximum achievable phase modulation.
© 2010 Optical Society of America
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