Crosstalk is a cause of a major perceptual problem in the 3D display system shown itself mostly as ghosting. In this work
we aimed at investigating how much perceived crosstalk that is acceptable for the end-users in movie type contents
played by 3D projection systems. Two types of 3D projection systems (one system using active shutter glasses, and the
other system using passive polarized glasses) were compared in the experiment. The study included an objective
measurement of crosstalk in the 3D projection system and a subjective users’ experience of the visible distortions. The
results shows that 10% can be considered as a crosstalk threshold for end-users not to be annoyed (MOS<3.5) by the
distortions and thus acceptable. The distortions start to be perceived at about 3% crosstalk. The study found a linear
relationship between perceived crosstalk and the amount of crosstalk. The perceived crosstalk also varies largely
depending on the video contents.
We present a fast-switching, contrast-enhanced liquid crystal polarization modulator suitable for use as a polarization
switch in time-multiplexed stereoscopic 3D applications. By utilizing a double-cell structure together with a dedicated
driving scheme and an external quarter-wave retarder we can achieve fast, powered switching between two orthogonally
polarized output states with completely symmetric operation between left and right eye images, including high extinction
at all wavelengths for the dark states. The polarization modulator is especially attractive for the use in combination with
high-end DLP®-based, single-lens stereoscopic 3D projectors operating at high frame rates, and enables high-brightness,
low-ghosting viewing using lightweight and comfortable circular polarized passive 3D glasses. The practical advantages
of a fast 50μs polarization modulator are discussed.
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