Actually, if you'll look at the operating instructions for your Ipad, you'll find the temperature limitations at 0º and 35º C (32º to 95º F).
Here in the U.S. in aviation, the move is underway to substitute Ipad (and other) electronic devices for the various "paper" items required for navigation and other reference. The devices are termed Electronic Flight Bags[i, (EFB). Most of the large airlines have already substituted computer generated documents, but the memory for these reside in on- board computers.
The problem recently found with the Ipad type EFB's is that sometimes the crews lay them on the floor next to the pilot's seats or perhaps on the glare shield. When they pick them up to use them for reference again, many times the screen will be black, and unuseable, of course, due to exceeding temperature limitations.
If left to cool down for a few minutes, the display will come back up. Same thing is true if the device is left in a "cold" airplane overnight... they won't work until warmed.
Lastly, the devices are [i]polarized] but only in the "landscape" mode of viewing. If the pilot picks up the device and hasn't "locked" the viewing mode in "portrait" and it's in the "landscape" mode, he'll find that it's unuseable if he/she is wearing polarized sunglasses. Several bugs to overcome, it seems...