I can't see how there even CAN be real difference, apart from unit-to-unit varations as EldRick says. The screens are all from the same manufacturer using the same technology. Except for cases like the old Sony Touch models where they laid a resistive touch layer over the top and that caused some blurring, there should be no differences.
There COULD be readability issues if fonts were displayed with thicker strokes or something, making it appear that there was more contrast.
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