148
User’s Guide
Chapter 7
Configuring Key ForceWare Graphics Driver Features
Horizontal
sync polarity
Click the up or down arrow to specify the direction of rapid, transient change in the
amplitude of a signal from the baseline during the horizontal synchronization pulse.
If the horizontal synchronization polarity is positive (+), the value of the horizontal
synchronization pulse is higher than the baseline value.
If the horizontal synchronization polarity is negative (-), the value of the horizontal
synchronization pulse is lower than the baseline value.
Note:
You can select the horizontal synchronization polarity independently of the
vertical synchronization polarity.
Scan rate
Scan rate indicates the measure of how many scan lines a monitor can display in one
second, expressed in kHz (generally somewhere between 20 and 180 kHz).
Note:
In the case of an analog display (CRT) it is limited by the speed at which the
display can move the electron beam horizontally across the screen and then return it
to the beginning of the next line.
Note:
This value should not exceed the display's maximum horizontal scan
frequency.
Active pixels
Indicates the number of all visible pixels in one horizontal line.
The
Vertical lines
group box contains vertical advanced timing settings.
Sync width
Click the up or down arrow to specify the blanking period during which the
synchronization pulse is active.
Front porch
Click the up or down arrow to specify the vertical blanking period that occurs
between the end of the active period and the beginning of the synchronization pulse.
Back porch
Click the up or down arrow to specify the blanking period that occurs between the
end of the synchronization pulse and the next active period.
Vertical sync
polarity
Click the up or down arrow to specify the direction of rapid, transient change in the
amplitude of a signal from a baseline during the vertical synchronization pulse.
If the vertical synchronization polarity value is positive (+), the value of the vertical
synchronization pulse is higher than the baseline value.
If the vertical synchronization polarity value is negative (-), the value of the vertical
synchronization pulse is lower than the baseline value.
Note:
You can select the vertical synchronization polarity independently of the
horizontal synchronization polarity.
Refresh rate
Refresh rate refers to the frequency at which the entire screen is refreshed.
Specifically, refresh rate indicates how many times per second the electron beam in
the picture tube is moved from top to bottom in the case of a CRT (analog display).
Note:
This frequency is limited by the display's maximum horizontal scan rate and
the current resolution, as higher resolution implies more scan lines.
Note:
The value should not exceed the display's maximum vertical scanning
frequency.
Specify the frequency at which your entire screen is refreshed, or retraced, to prevent
the image from flickering.
Active pixels
Indicates the number of all visible pixels in one vertical line.
Table 7.2
Advanced Timing Parameters
(continued)
Advanced
Timing
Parameter
Description
nViewGuide_.book Page 148 Thursday, September 14, 2006 1:14 PM
