Mitsubishi lt-3280 Owner's Manual

For the correct screen resolution (pixels), while the PC is displayed on screen, 
use the PC’s Control Panel settings, as shown below (for most PC’s).  Your 
display can display VGA, SVGA, XGA, and SXGA refresh rates.

1.  In the PC’s “Start” menu, select “Settings”.

2.  Select “Control Panel”.

3.  Select “Display”.

4.  Select the “Settings” tab.

5.  Depending on your PC, use either the Screen Area slider or the Screen 
Resolution slider to adjust the resolution.

You may need to restart your PC for this change to take effect.