Apple's panels / Samsung, Sharp, and LG


I curious about the panels Apple uses for all their iOS devices including the new iPad.

Here are the questions I have:

Does Samsung make the screen for the new iPad?
Can Samsung use the same panel that the new iPad uses in another device? (On a galaxy tab or something similar)
Who made the screen for the iPad 2?
How come no one using the same panel in the iphone 4s? Is it legally only for Apple?
Was the screen for the 4s a different manufacturer than the 4?
Why did the ipod touch not have the same screen as the 4?