The German Fraunhofer Institute IPMS developed an OLED light source with touch interface.
Aside from displays, OLED technology is also getting a lot of attention in light source development. As OLED is a cold light source it is safe to touch. The Fraunhofer Institute took this property and turned it into a feature to control the OLED light.

Switching and dimming the light could be easily controlled by a hand movement, which overcomes the traditional controller function.

The cool thing about this Touch OLED light is that the OLED itself is used to read the hand movements. There is no additional layer necessary for the touch interface.
I wonder if the same technology can be used for OLED displays. If you can use the display OLEDs also for reading the touch information future touch screens would get slimmer and cheaper.
Via Oled-Display