Returning to the front of the display assembly, we pop off a plastic bezel and find a secret perimetric circuit board.

Looks like we've found the source of the new Kindle's touching sensibilities. A grid of infrared LEDs and receivers crosses the display, powered by Neonode's zForce tech.

The LEDs project away from the display, into small wells in the plastic bezel. These wells collimate and reflect the light back across the face of the display, in wide flat bands to be received on the opposite side...

...until your finger gets in the way and blocks the band, registering a touch.