Chapter 3 Control Box 9
The F-Scan Converter accepts 60Hz VGA or RS 170 RGB. It converts these
signals to the F-Scan Format. This allows use of the FS5 with graphics
sources that cannot generate an FS5 signal format.
For further information about the F-Scan Converter, contact Virtual Research.
outputs
Control box outputs are located on the front panel of the box.
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ABCD
VR MONITOR
BRlGHTNESS
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CONTRAST
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Control box front panel
Monitor Output
One channel of monitor output is provided at the front of the control box. The
output is from the left eye input. RGB outputs are line driven and 75ohm ter-
minated. Sync outputs are unterminated TTL level signals.
The output signal format is not standard and will not work with most monitors.
The signal is generated by taking the field sequential input used by the FS5, and
splitting it out onto separate red, green, blue, H sync and V sync lines. This
signal has a field rate of 180 Hz, and the colors are only present on each third
field.
There is a drawback to this approach--because the monitor is only receiving
color signals in every third field, the picture has about l/3 the brightness of a
normal picture. For many applications, this is not a significant problem. But if
your application requires high monitor brightness, this approach would not be
recommended.
We have not done any extensive monitor evaluation, but we have not found any
monitors that are specified at 180 Hz field rate. And in fact, several monitors
we have tested will not accept this field rate.
However, we have discovered that some monitors will operate at this rate. In
our lab we have worked extensively with the Hitachi SuperScan pro 21”. Al-
though it is specified only to 160Hz, this monitor operates at up to 2OOHz.
