Hey, thanks for your response.
I look that link, the model is different, but the principle is the same.
"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."
"The touch grid is made up of two distinct circuit boards, joined by a small ribbon cable.
One is lined with LEDs and projects, from the top and left side of the Kindle's display,
and the other is made up of IR receivers (likely phototransistors),
and makes up the right and bottom edges of the display.
We pulled out our favorite home-hacked IR camera to see this in action.
There's a bit of circuitry on the receiver board, to monitor the breaks in projected light and detect touch:
Neonode zForce NN1001 Single Chip Optical Touch Controller
Texas Instruments MSP430G2 Ultra Low Power Microcontroller"
Guess the sensors are on the motherboard, not the display.
I have to look for those chips, Neonode zForce NN1001 and Texas Instruments MSP430G2 on my board
and see if I can find anything, like burned parts around them or something like that.