Just as many others, I got a small TFT monitor used in car reverse cameras. This monitor has a 12V DC input for power but, as SK Pang points out here, internally it has a 5V regulator and uses that for powering the unit. Unlike what SK Pang did, I did not need to replace the 12V power feed with a 5V one, what I did instead was get the 5V required for the Raspberry Pi from the monitor Regulator.
My monitor is slightly different model from the one SK Pang has (although it looks identical externally).
The picture bellow shows how I connected a USB cable for feeding the RasPi:
And this is my RasPi powered by the monitor and showing a quick mock up of how the GUI will look. I used Mindchunk's OpenVG library to make that GUI (for now it is just a quick and dirty test).
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