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Well... I have a Sony PRS-505, PRS-300 and an Aluratech Libre. All are quite legible but I prefer the e-ink to the lcd.
The lcd suffers from the problems all lcd displays have. To get maximum contrast I have to view the screen at an angle. If I look at it straight on, the contrast is no better than e-ink.
The lcd has a slight greenish-yellow cast to it in contrast to the neutral very light gray of e-ink.
Battery life is longer for e-ink but that just means that I have to charge the Libre more often.
LCD displays update faster but e-ink isn't really any slower than I turn the page in a book so I don't see that as an issue.
I have no issue with reading on either an lcd of any type or e-ink. I spend up to 12 hours a day with a computer (22-24" screen) with no problems. All that is required is to set the contrast and brightness correctly. And the correct strength of reading glasses for the conditions.
Resolution is very important (in terms of pixels per unit length). The 5" lcd has about the same resolution as the 6" e-ink. The 5" e-ink display is much better and appears sharper.
That said, I prefer e-ink for reading, colour would be nice.
There are other factors as well. The "fit and finish" of the Sony readers is far better than the Libre. The Libre feels cheap and shoddy. I expect the poorly designed cover for the memory and usb connections to break and fall off no matter how careful I am.
If (when) I get a new reader, the display is only a small part of the criteria I will use to choose with. But my preference, all esle being equal, would be for e-ink.
Note: LCD display do NOT have a refresh rate. The refresh rate only refers to the number of times an electron beam draws the screen on a CRT. This parameter has no meaning for the lcd display.
cheers
the grumbling curmudgeon
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