I am not a big fan of OEL diplays during the day time. With tinted windows during the day, I have trouble seeing mine. I have set on the brightest setting. Just a comment.
Almost all head units have the 'problem' of sunlight washing out the display, and if you think about it, the sun is incredibly bright in the car-even with tinted windows. In order for a display to effectively counter the sun, the display itself would have to be blindingly bright.