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I could be mistaken, though the inherent problem with an "above-the-display" IR emitter system that others are suggesting is that all you need to get some dust or another obstruction at the edges of the screen bevel and the display and all of a sudden it can't "see" anymore. Seeing as, to my knowledge, this isn't the case, I doubt this is how it functions. (also you'd figure the Kobo website would have "make sure the edges of your screen are clean" as a suggestion for people who's screens aren't responding to touch.) Having done some research on modern IR displays, I've read that they work by beaming light through a layer of plastic above the display, and when you apply pressure, the light refracts differently and this is detected by the device.
Also seeing as the kobo vox uses the same IR touch display (again, Kobo flat-out states it's IR on their website), and there is clearly no space at the screen bevel to have incorporated IR LEDs or photoreceptors, I think it's safe to say the IR beaming/reception takes place within the first layer of the panel, not above it.
If you've ever tinkered with a video camera (even a phone's camera), you can see that IR devices, like TV remotes, emit light visible to the camera. Simply put: cameras can see infrared light. If you look through a camera at the edges of the screen of the kobo when it's off VS on, you'll see no difference. If there were hundreds of IR emitters along the edges, I think the edges of the display would appear illuminated when looking through a camera.
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