I'm playing with the MPR121 touch sensor controller demo kit from Freescale... and it works :-)
Now I want to assembly a complete capacitive touch keypad that can be seen without ambient light, so I'm trying to find a solution for backlighting.
The keypad should have three layers: the PCB with capacitive pads, a transparent sheet with a diffuse light and a opaque label with transparent symbols what I want show.
What kind of transparent sheet should I use? I think a material similar to a light pipe that is used to bring the light of a LED in another place. But I don't know any company that can manufacture this kind of sheet.
Can you suggest someone? I'm going to produce 1000pcs, I don't know if someone create a custom for me for my project.