Game Development Reference
In-Depth Information
The second axis of research was the implementation of a new class of liquid crys-
tals, known as ECB, for Electronically Controlled Birefringence. This is a new type
of LCS, different from the obsolete OCB, or Pi-Cell, and outperforming the current
industry standard Super Twisted Nematics (STN). The ECB LCS have faster rise and
fall transition time, with 250 and 1200 microseconds. They offer better color neu-
trality and light efficiency in transparent mode. We produce LC layers as thin as 1.5
micrometer, drastically reducing the light incidence effect on the optical performance.
As a result, the peripheral vision does not suffers any cross-talk as with competing
technologies.
One of the advantages of separating the lenses from their driving electronics is
to allow us to run small batches of specially designed optics. We will produce glasses
with very high extinction for low ghosting levels in high-power projection systems.
We will also produce more color-neutral lenses suited for color timing in movie post-
production. The electronics design is muchmore efficient too, withmuch less constraint
on size and weight. The first generation of driver includes all the elements to make
the eyewear an intelligent device. The Infra Red (IR) receiver is capable of automati-
cally recognizes most existing synchronization protocols. About the software side, the
micro-code loaded on the electronic driver exists in many versions. They are adapted
to the professional requirements of the various markets we address. For more infor-
mation regarding the Volfoni's Intelligent 3D Eyewear, please refer to the websites
www.volfoni.com and www.activeyes.com.
11.2.3 Large screen projection systems
To simulate a large field of vision to the user so as to help immersion of his eyes, certain
devices are based on video projectors displaying images on large passive screens. The
images are often projected via mirrors to restrict the overall size of the system. But a
new, less bulky technology is being developed, which will compete with video projec-
tion: the active flat stereoscopic screens, developed from flat screens (monoscopic) of
a television. In both the cases, the stereoscopic technologies used are the ones using
eyeglasses for image separation.
11.2.3.1 Multiple projector architecture
The number of video projectors used to display the images on the screen can vary from
product to product. As the number of projectors per screen increases, the quality of
images improves, but at the same time, the complexity of the system also increases. If
more than one projector is used for each screen, it is absolutely essential to provide
for a system that ensures the continuity of contiguous images. There are two solutions
possible: We can either juxtapose the projected images and align them perfectly (see
figure 11.4), or we can overlap them a little. In the second case, it is necessary to use
an edge blending software or hardware to make these overlapping zones invisible to
the eye. This technique consists of superimposing the borders of connected images and
reducing the light intensity of overlapping zones so that the additional intensity of the
two video projectors is equal to the intensity of the non-overlapping zones. With LCD
or DLP projectors (see further on), this technique is all the more difficult to implement
and adjust because unlike the CRT projectors, perfect black cannot be obtained in
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