I think it's a little odd that screens on personal devices are going in the direction of super-high viewing angles and brightness, as if letting everyone else besides you see what you're doing is a good thing... even the unbranded low-end Android I have has a screen with nearly 180 degrees of viewing angle.

However, this with a randomised button layout solve the problem quite well:

http://solutions.3m.com/wps/portal/3M/en_US/SDP_NaturalView/...