[liamkinne]

I wonder what the smallest circular OLED display is. There are 01005 LEDs (the next size down from the 0201's used here) but at that point an OLED display is essentially the same thing.

[dekhn]

I see models down to 0.5" (12.7mm) but they all seem to have large connectors you'd have to work to hide/connect an microcontroller to.

[kragen]

indium gallium arsenide and gallium nitride probably have a much longer lifetime than oled and will probably withstand higher temperatures (though the encapsulating resin may not)