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You can't easily add built in light to a Kobo Touch, or indeed any eink based reader as the rear of the screen is opaque. The lit ones use a special light pipe layer under the front of the screen. I'd not say it's impossible to add such a thing to a IR touch screen, though unlikely. Pretty much impossible with capacitive or resistive touch. Probably possible on a screen that only uses a Wacom stylus as it doesn't actually need to touch the actual screen and has a built in pressure sensor. A Wacom pen/stylus is actually powered by the device.
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