[Elias] made a custom driver board that takes an HDMI input and displays it on a very tiny, high-resolution display from a cell phone. The display used is the same as what comes stock in the HTC ...

The second part of the puzzle is a decoder that takes HDMI signals and drives a small ... a display through HDMI. Even Adafruit sells one of these converters. [Joe]’s board has another trick ...