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I know this has been mentioned on the forum before, but I couldn't find it in a search...
One option would be side lighting, using white LEDs at the side of the screen. I used to have a Sonly Clie PDA with an LCD screen that was side-lit rather than backlit. It was in colour and with pretty good dot pitch too.
The first Nintendo Gameboy Advances had similar screens (non-backlit, colour LCDs) and people were able to retrofit some white LEDs to the side the screen and light them that way.
Not quite as bright as backlit, and colours a bit washed out but very usable.
Size of screen might be an issue though since you are lighting from the perimeters
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