Windows – Monitor screen resolution changes when laptop lid is closed

displaymultiple-monitorsresolutionwindows 7

My monitor screen resolution changes depending on wether my laptop lid is open/closed.
The lid being open has a lower resolution than being closed. Why is this ?

In control panel I have :

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Laptop lid open :
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Laptop lid closed :
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Best Answer

If you choose to Duplicate these displays, your computer has to choose a resolution that is supported by both displays.

If you cannot choose a higher resolution with the lid open, it means that 1024 x 768 is the highest resolution supported by your internal display. Obviously, this restriction does not apply when using only the external monitor.

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