There should be a distinction between backlit and non-backlit LCD.
And for me, I read with a backlit LCD PDA or phone for 7 years, and I still do on-the-go, but I now prefer reading on E-Ink at night.
A backlit LCD makes it easy to read at night, but my eyes start to water after about an hour.
But I can read an E-Ink device (with clip light) for 4 hours.
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