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Larger LCD screens have ~100 dpi. Smaller screens, such as mobile phones and some laptops, have substantially higher resolutions. The iPhone, for instance, has a screen which is 160 dpi. Presumably this is how Liquavista achieve their dpi of 160, since they use the same manufacturing process as common LCD displays.
It is worth noting that how smooth text looks does not depend only on the dpi but also on how you anti-alias and display it. LCDs have many more more shades of gray to play with than does a current generation e-ink display (which are usually 8 or 16 shades, I believe) so will produce smoothing-looking text for a given dpi.
I was thinking of buying an Adam until I saw the Liquavista demo. Now I'm going to wait a while. Why bother switching between B&W and colour when there'll be displays that can produce paper-like colour without draining the battery?
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