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Linear & Circular Light Polarization
A light wave rotates in any direction. The specific
orientation at any given moment determines the
polarization of a light wave. By passing unpolarized
light through a polarizer, only one of its orientations
emerges.
By organizing the polarization oppositely for the
left and right eye we can direct different
information to the left and right eye, thus creating
depth perception. As the human eye itself is largely
insensitive to polarization, changing the orientation of
polarized light does not change what we see.
Passive
Passive
With Two Projectors
One projector displays the left eye information and the
other displays the right eye information, both at a
standard refresh rate.
A polarizing filter mounted in the optical light path
of each projector ensures that the correct information
passes through its corresponding filter in the pair of
passive stereo glasses.
This two-projector approach has the added value of
providing higher brightness.
2 CRT
Projectors
Although weaker in light output, a CRT projector
allows for the highest resolution large screen
images, with unparalleled visual fidelity.
Barco CRT projectors offer a motorized polarization
filter as an option for stereoscopic projection, whereby
the filter can be rotated away from the lens for
standard non-stereoscopic projection.
Linear Polarization
If light is polarized in a single direction (north/south,
east/west, or even oriented diagonally), it is defined as
linear polarization. When one changes the orientation
of linear-polarized glasses by tilting his or her head, so
that the resulting orientation of polarization does not
match that of the polarization filter mounted on a
projector, there will be a loss of stereo information as
perceived by the viewer.
Nevertheless, linear polarization is a cost-effective
technology that can produce excellent image separation
between the left and right eye, for stereoscopic
applications whereby head tilting is limited.
Linear polarized light
Circular polarized light
3D DISPLAY SYSTEMS
Two CRT or DLP™ projectors
2 DLP
In high ambient light conditions or for very large
screen applications, this solution is optimal.
Barco offers a range of high-quality DLP™ (Digital
Light Processing™) projectors with light output from
5,000 to 18,000 ANSI lumens. For stereoscopic use,
however, "stereo lumen" - which equals less than half
the ANSI lumen value - is the realistic measurement
of brightness.
Non-depolarizing screen
Pair of passive stereo glasses
™
Projectors
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