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The idea of IR touch screens isn;t new and the company that supplies (I believe) the system used by Kobo has been around for a while, they even used to make a mobile phone which they used to showcase the IR technology.
I had one and it used to compensate for changing light levels and was certainly up to writing text messages at a reasonable speed. It also had swipe to unlock before Apple used it.
I've also seen them used in industrial settings so the screen wasn't affected by gloves, oil on hands etc. and they were built into a removable bezel which made maintenance/swap out easier.
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