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The iRiver Story Cover, (eInk) actually had a touch calibration function. Though it was resistive.
I think Kindle Touch, Kindle PaperWhite and many Kobo use IR light on the surface*, it's low resolution like capacitive, but really they need a calibration thing as it takes AGES to train oneself to touch at correct place. IMO the selected point should be slightly above centre of touch.
It seems poorly implemented on the Kindles and the Kobo H2O.
[*Because resistive or capacitive layers reduce the brightness of the reflected ambient light twice as much as LCD /OLED, which can be brighter than ambient easily]
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