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a special surface, or projected separately to the eyes. Stereoscopic displays by
definition all require some kind of eyewear to perceive 3D (otherwise they are
called autostereoscopic, as seen later). Separation of the two images, correspond-
ing to the left and right eye happens either time-sequentially, or by means of dif-
ferentiating wavelength or polarization.
2.1 Time Sequential Separation
In the time sequential case, left and right images are displayed on LCD or PDP or
projected one after the other, and then separated by shutter glasses that block
incoming light to one eye at a time, alternating the blocked eye with the same fre-
quency as the display changes the images. Such shutter glasses are usually imple-
mented with LCDs, which become transparent and opaque synchronized with the
display. Several companies provide shutter glasses based 3D solutions including
LG [4], Panasonic [5], Toshiba [4], eDimensional [6] and NVIDIA[9], projectors
with high refresh rate for stereoscopic operation [7,8], and NVIDIA also provides
a stereo driver to use the glasses with PC games [9]. A stylish NVIDIA shutter
glass can be seen in Fig. 1, with the IR sensor used for synchronization in the
frame of the glasses.
Fig. 1
NVIDIA 3D Vision Glasses. Image courtesy of NVIDIA Corporation.
2.2 Wavelength Based Separation
Wavelength based separation is achieved by tinting the left and right images using
different colours, overlaying the two and displaying the resulting 2D image. Sepa-
ration is done by glasses with corresponding colour filters in front of the eyes, as
done in the well known red-blue or red-green glasses. This method of creating
