Christie DS4K User Manual page 74

Section 3: Operation
Software Requirements
Customizing the
Input Signal
3-52
cross-talk in 3D (stereographic) applications) as well as other more subtle color
artifacts. Such problems indicate that the eyes are detecting portions of the
opposing frame due to an "out-of-sync" system, and can occur in either active
or passive 3D configurations.
In the Advanced Image Settings menu, the correct "3D Stereo Sync Delay"
setting helps to synchronize glasses with the displayed images. See also
Customizing the Input Signal, below, for examples of well-synchronized
systems.
NOTE: In a passive system, where glasses do not have shutters and instead
depend on the speed and accuracy of the Pi Cell polarizer, the input signal
must be synchronized with the polarizer.
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To customize your 3D (stereographic) input signal for use with the projector, you will
need access to software that controls video output timing from the graphics source.
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The display must be synchronized with shutter control—called gating—so that each
eye receives only the frames of data intended for it, otherwise you will detect
opposing data frames (cross-talk) and see faulty images. This requirement means that
timing parameters in your source should guarantee the following:
◊
Each new frame begins after the opposing shutter mechanism is closed
◊
Each frame completes its display before the opposing shutter mechanism
begins to open.
◊
Each frame (mirror sequence) is displayed in its entirety to the correct eye.
What To Adjust
Since most current 3D-video sources (stereographic) do not have the necessary
characteristics for use with Mirage, you must synchronize the projector's display with
your gating mechanism by adjusting the vertical sync width and/or vertical back porch
of the input signal and, in many cases, by adjusting the projector's "Dark Interval"
control. These two parameters—input timing and dark interval—are described below.
Note that because they interact with each other, you may have to go back and forth
between them when optimizing the 3D display.
(1) Vertical sync width and/or vertical back porch blanking of your input source.
Choose the vertical sync width and/or vertical back porch timing to determine
when the next field begins displaying relative to the vertical sync signal. The
degree of timing adjustment needed depends on the specific signal at hand as
well as the performance of your glasses. An example of improvements to poor
synchronization is shown in Figure 3.29. After adjustment, shutter changes
occur during the dark interval between frames.
NOTE: The example in Figure 3.29 assumes that the first active line of your signal is
displayed on the first line of the Mirage display panel rather than being repositioned
higher or lower using the projector's V-Position control.
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