The brightness is controllable through the DIM function of the display. My guess is that your AOA isn't operating properly as the colors should be no different then the EMS or any other indicator on the EFIS.
The donut is clearly visible, especially the green portion. The audio works and is clearly understandable and the flap position indicator is operating normally and clearly visible. The data comes from the dual Dynon ADAHRS and is indicating stall at least via the audio. Where would I begin to diagnose this issue?