Before iPod came out with the iPod video, I was thinking about a portable video device that can support a large display in a compact unit. iPod video is a step forward, but who would watch a full-length movie on such a small display, much less watch it with someone else ?
What if you could do a mini projector that would fit into the form factor of an iPod video (or perhaps make it slighly bigger)? This is not intended to be used in a large conference hall for a professional presentation, but perhaps to watch a video with a friend or to watch a movie on an airplane on a projected screen of the size of a common laptop display perhaps.
Here are some challenges and possible solutions:
1. Power drain: a standard projector lamp uses a lot of power, however there are already some
LED based projectors out there. Again we are talking about a small screen and relatively short throw distance here. With LED, there is no heat, there is no warm-up/cool-down period and there is no bulb replacement after so many hours.
2. Screen: You need something to project the video on. A piece of white paper? Wrinkle-free folding fabric ? That should be easy.
3. Internal vs external: This could be an external plug in unit that attaches to the iPod through the dock connector. It may even have it's own rechargeable battery so that it doesn't use up the iPod battery. Once the technology improves I can see Apple offering it as an integrated iPod video projector unit.