OT: Which tablet?

[kitepilot at kitepilot.com]

Hello there:
I need the tablet with the biggest screen (Android or Mac) that can be 
visible in direct sunlight as well as dim(able) to the point of being 
visible under *VERY* low light without blinding brightness. 

This is the test for brightness:
Stay in a totally dark room for an hour and then turn the tablet on.
If you get a barely uncomfortably blinding screen, it is too bright.
Price unimportant, I hope that I don't have to go Mac, but my Android phone 
hasn't had a shining performance either...   :(
Thanks!
ET