For completeness sake I've tried an inverse display too

http://home.clear.net.nz/pages/joecolquitt/led+lcd.html

They're a little uncommon. Had a few lying around for ages and
not used them yet. Generally thought them too dark and sinister-
looking but backlighting is an improvement and they don't look
quite so Goth. Subtle and unobtrusive (some might say furtive)
compared to standard LCDs 




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