Sorry for the bad translation.. not my mother tongue 
Only Dell LCD screens:
1- Turn off your screen.
2- Press simultaneously the 'Menu' and '+' button of the screen.
3- While holding the 2 buttons press now the 'Power' button.
4- Once the screen in ON, unpress the 3 buttons.
5- Go to OSD menu (by pressing 'Menu' button) then select the 'Reinit' option (red point at the bottom of menu).
6- Select 'Factory' option.
7- You can see now the panel manufacturer.
Only Dell LCD screens:
1- Turn off your screen.
2- Press simultaneously the 'Menu' and '+' button of the screen.
3- While holding the 2 buttons press now the 'Power' button.
4- Once the screen in ON, unpress the 3 buttons.
5- Go to OSD menu (by pressing 'Menu' button) then select the 'Reinit' option (red point at the bottom of menu).
6- Select 'Factory' option.
7- You can see now the panel manufacturer.
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