Scientists Add Touch Capabilties to OLEDs
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Oct 10, 2008, 1:32 PM by Eric M. Zeman
Engineers at Fraunhofer IPMS have devised organic light emitting diodes that can be controlled by touch. Right now, they envision being able to turn lights on and off via touch. Typical touch screens have to have additional touch foils on the top of the devices. This new technology from Fraunhofer doesn't need those foils, because the OLED itself is used to read out the touch signal. It wasn't clear if the technology could be used to create touch screens for devices such as mobile phones.
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All LED's (OLEDs) can sense light
Each pixel is effectively its own independent sensor, so the technology could also be multi-touch. Infact, it should have the complete raster outline of the object touching it, so it would be even better than capacitance.
This is a very strange and misunderstood property...if you are interested, you can do some research on theory and a few implementations of this.