HP USB Dual Output USB Graphics Adapter - Manual (Page 16)

3. Check the This is my main monitor box on Windows Vista and Windows 7 or Use this device
as the primary monitor box on Windows XP.
On some PCs and notebooks it is necessary to disable the main display (uncheck the Extend
the desktop onto this monitor box for the main display) as part of the same settings change.
4. Click OK to close the settings screen.
The add-on monitor stays primary if the PC enters hibernate or suspend mode or is rebooted. If the
add-on monitor is unplugged, the main display becomes primary again.
Adjusting Resolution, Color Depth and Refresh Rate
There are three components that make up the screen mode:
Resolution: In common usage, this refers to the number of pixels displayed on screen horizontally
and vertically.
Color Depth: This defines the number of different colors that can be shown on the screen at the
same time.
Refresh Rate: Measures the speed that the entire screen is rescanned. Higher frequencies reduce
flicker.
Most monitors advertise the supported modes through the video connector. If this is the case, the
adapter identifies the supported modes from the monitor. If the monitor does not advertise the
supported modes, the adapter software chooses a set of common screen modes for the monitor.
The software supports resolution modes up to 1920 x 1200 or 2048 x 1152 on DVI monitors and 2560
x 1600 on DisplayPort monitors.
NOTE: The resolutions and refresh rates available through Windows are a combination of the
support from the following elements:
• The USB display adapter
• The primary monitor and the add-on monitor
• The primary video card on your computer and installed drivers
Therefore, for example, if your monitor does not support a resolution of 1920 x 1200, then 1920 x
1200 is not possible even if you are using a USB display adapter with 1920 x 1200 support. This
ensures that the monitor cannot be put into an unsupported mode, which might damage it.
If cloning the primary display, the video component will try to use the preferred monitor mode. In
some cases, this may not be the most appropriate mode for the cloned desktop. It is recommended
that the primary display resolution be changed to closer match the default resolution of the add-on
monitor.
To configure the three components (resolution, color depth, and refresh rate) of a screen mode,
follow these steps:
1. Position the cursor anywhere on your Windows desktop, right-click and select Personalize >
Display Settings on Windows Vista and Windows 7 or Properties > Settings on Windows XP.
2. In the Display drop-down menu, select the option that ends with HP Dual Output USB
Graphics Adapter.
3. To change the screen resolution or color quality, select those options on the screen. Be sure to
select one of the supported resolutions and color quality numbers. For an add-on monitor, you
can also select any resolution or color quality supported by that monitor.
10 Chapter 3 Using the Adapter