I'm really surprised this hasn't been asked yet...at least I can't find it if it has.
I use a 4th Gen iPod Touch connected to a projector at events to display the photos I'm taking in real time. When I can plug in the iPod to an outlet for power, things work fantastic. Sometimes I'm dealing with a projector that is integrated into a venue and there is no power for the iPod.
I want to be able to run the slide show on an external projector but with the internal screen off to help save batteries. If you just switch off the iPod, the slide show stops. I've tried letting the screen time out with no luck and I've even tried the new backpack mode with no luck.
Is there a way to run the slide show only on the external display to get maximum battery life?
