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All recent touch screen e-readers, including Sony, use infra red beams.
Readability is not affected.
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Originally Posted by Kubizo
A touch screen can't be anything but a layer on top of the e-ink screen, then it must affect the contrast and reflect more light.
Yes it can, and no it does not. See above.
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You are mistaken. The infra-red touchscreen used by the Sony (and all other current touchscreen devices) is not "a layer on top of the e-ink screen", but a grid of completely invisible infra-red beams emitted from the side of the screen bezel. It has no effect whatsoever on screen clarity.
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I have to say thank you to both for correcting my wrong opinion. I really should try out a recent touch then. Thanks again
What about battery life though? Keeping those infrared beams always on must use some energy!
Many thanks again