I had a unit from an 5 series that would have been viewed from a higher angle in the car so it was very dark. The screws that adjust the screen do all sorts of things to the screen - brightness, contrast, saturation, angle, so make sure you note down the original settings before you play around with them. Turning some seems to have little effect at all while others make significant change. Haven't yet seen a post where someone explains which screw does what - its a bit of trial and error.