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I've seen some prototype laptops with a bistable e-ink touchscreen on the back, that could retain its image with the laptop turned off.

http://www.computerworld.com/article/2604775/intel-pastes-se...

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I know it's low-tech, but I just keep a pad of sticky notes in my laptop bag. If I write a note, I can stick it to the screen when I close the laptop, and it's there to remind me when I get back to the office.

And my cousin is a sales rep for a drug company, so I have a whole crate of logo-ed sticky notes.

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