Optoma 3D-RF System User Manual page 19

Figure 2: Mitsubishi 3D DLP TV with a 3D Emitter port in the back (left) and alternating frame 3D image in the front (right)
that match the timing described here. The emitter will work out-of-the box for this case with no performance tuning.
Eliminate Ghosting or Fuzziness
When the glasses are attached to certain 3D systems, some ghosting or fuzziness may appear. This is
unlikely to occur when the Infra-Red receiver was used. It may occur in some computer systems where a
delay in the system has occurred between the 3D Glasses Emitter port and the alternating frame light
emanating from the display. This delay between display and glasses causes some of the left image's light
into the right eye and vice versa, causing a ghost, or faint double image, to be visible on the display.
Figure 3: Graphics Card with Stereoscopic connector and 120 Hz monitor with 3 ms delay. In this case the stereoscopic signal
The video signal is delayed by the monitor, so delay must be added to the 3D emitter signal so that the
signals match again. This is the function of the delay knob in the delay control in the performance tuning
mode. The chart below is a timing diagram that says in chart form the same thing as these words.
3D Emitter Signal needs
to be delayed to match the
Copyright 2011 Bit Cauldron Corporation
may need to be delayed to match the delay of the monitor.
Frame
One
Video Frames from
Left
Graphics Card
3D Emitter Signal
High = Left
from Graphics Card
Video Frames are
Left
delayed by monitor
High = Left
monitor delay
Figure 4: The delay compensated for by the Delay tuning control.
Frame Frame
Two Three
Right Left
Low = Right Left
Right Left
Low = Right Left
Frame
Four
Right
Right
Right
Right
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