You might try passive 3D sunglasses.
http://m.imore.com/ipad-direct-sunlight
http://www.bestbuy.com/site/sony-passive-3d-glasses-black/8801785.p?id=1218895847427
http://m.imore.com/ipad-direct-sunlight
http://www.bestbuy.com/site/sony-passive-3d-glasses-black/8801785.p?id=1218895847427