This monitor seems to be more or less an implementation of Windows SideShow, no ? If so, there is an implementation for Android phones (which also works for Windows mobile). I didn't found anything for iOs, unfortunatly.
If it's not what you're searching, things will be a little more complex.
There seems to be something for iPad, similar to Maxivista : Maxivista for iPad, but obviously nothing for iPhone (talk about segmentation !).
A long time ago, there was Sidewindow for Pocket PC (but all that is definitely dead).