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Anti Glare for tobii
Here i found one that is designed for ATM screens as does not inhibit touch signals... i decided i would throw this out here.
its a 15.4 wide screen so if its 15.4 square some cutting will need to be done... there is a 17 inch one available if you need to cut more for the tobii screen... not extremely knowledgable on the screen size...
http://www.amazon.com/Widescreen-ViewGuard-Anti-Glare-Protector-Flat-Scr...

The biggest issue is power - to see a screen outdoors we would have to overcome the brightness of the sun ~ this is a large order to fill :) Unless a system has a transflective display then yes in direct sunlight they will wash out. Transflective screens are great outdoors put not great indoors - they are also pricey.
Just my 2 cents
The TFT i covered with a touch film and to put anything on this surface would not do any good. To get it work better a "sun cap" or transrefexive TFT or higher TFT-brightness is the solutions. The product looks as it looks and there is no way to increase the brightness. The remaining solution is to use a sun cap on the P10.
begt-re
IF the screen is anything like an ATM then I think this touch film would work. its cheap and easy, i hope one of our users gets it and experiments so we can see if it works well