From what I got they ain´t blue, all models are with white LEDs just "painted" over with various colors.
I mean they ain´t painted themselves, the polarizer I think is.
Blue OLEDs aren't painted over LEDs.
OLEDs aren't bipolar LEDs at all.
Look at the two different available versions. The white one and the blue one. The difference is on the film they put on them.
That´s probably the polarizer film.
It´s much cheaper to manipulate the polarizer film rather than the whole display. And yes they do come with a polarizer.
I also confirmed it with my laptop display. The probably use it to enhance the contrast between the dots.
In fact, most monochromatic oled displays are probably white OLED displays with colored polarizers.
I´ve worked with a different kind of OLED display before, they were from Winstar with a WS0010 controller inside. The DC-DC converter inside was terribly noisy.
Have you thought of separating the supply of the DC/DC converter of the display from its Vcc line? What you are describing is a classic microcontroller lock-up scenario.
There's no obvious noise coming back. Trust me, I know how to look for problems. There may be noise on the module, or inside the controller, but that's not really fixable.
Didn´t say other wise. Still I´ll be contacting my own experiments. A charge pump with some low ESR caps can be very nasty, even if you can´t see it on the scope.
Usually ESR goes up with capacitance, be that the case using according to the datasheet a 2u2 cap at the supply and 1u caps on the charge pump, you got a small recipe for disaster.
There are also posts on the Internet where people mention problems using these OLEDs with ADCs. All the more suspicious for your case.
But I do digress, I´ll be testing and posting here.