Windows 7 Laptop to external LCD monitor show low resolution

Hello,
I'm connecting my laptop to external LCD 1920*1080.
When Extend the display, each screen works with its full resolution allowed (Laptop has lower than 1920*1080 and the LCD works with resolution of 1920*1080), but when duplicate the display, the LCD has a black frame and the desktop is only at the center
of the screen and not an all the screen.
Is it possible, when duplicate the display, that each monitor work with full Resolution? or when
dup the higher resolution will be according to the lower resolution?
thanks.

Getting the best display on your monitor
http://windows.microsoft.com/en-in/windows/getting-best-display-monitor#getting-best-display-monitor=windows-7
Yolanda Zhu
TechNet Community Support

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My post has started a more extensive discussion on this problem at an Ars Technica forum:
<http://episteme.arstechnica.com/groupee/forums?a=tpc&s=50009562&f=67909965&m=41 90936913&r=796009877731#796009877731>
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