I think most displays are like that intellaworks. I have that problem as well. Heck, I can hardly read my radar detector when I'm wearing my polarized lenses (fortunately the sound coming out of that thing is all I really need).
I don't have sunglasses that wrap around too much, so I can still see the screen out of the corner of my eye without too much effort, so i just stick to that.. Sorry I don't have a better solution.