Naranek, I see what you are getting at, however, from the the link provided in your first post it implies that the power is coming from the output device not the display device, do you have any better sources that indicate the displays provides power on the 5V line?

Also 55mA is such a small amount of current as to be practically useless, you'd want the current to be over 500mA to be useful, and for reference the N900 charger outputs 1200mA.

Nice idea though.