Small, Portable, Battery Powered Lcd Screen

I'm building a halloween costume that i want to have a small lcd screen be a part of it. Here's what i need:

- A small screen, maybe 4x6in or so?

- No thicker than 3 inches deep. - It will display a picture that i will design and upload to it. - Needs to run on battery power. Disposable batteries would be best since i could replace on the fly as needed. Need it to be on for about about 5-6 hours. -Nothing too heavy

Any ideas? I've been eying digital photo frames but i cant really find any battery powered ones that'll last longer than a few minutes and require a wall recharge to keep going.

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