Designed by Rocco Avallone, Our Energy Information (OEI) is an interactive touch screen light switch that rates you on your energy consumption through a very low-energy colourful and animated display. It can also receive community information so you can see how your consumption compares to your neighbours. The idea is to make energy consumption interesting, and understandable.

Combining an energy monitoring device with a light switch, a highly visible "place where you're sure to look at and think about energy consumption" [1] increases its likelihood of being consulted.

via Treehugger

See: Heimbuch. J (2009)  "OLED Touchscreen Light Switch Monitors Power Use”, http://www.treehugger.com/files/2009/02/oled-touchscreen0light-switch-monitors-power-use.php  for more information.

The OEI concept uses Organic Light Emitting Diode (OLED) technology, a light emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compounds which emit light in response to an electric current. To learn more about OLED technology (what it is, how it works, how it is made and its commercial application) watch this YouTube Video or visit HowStuffWorks http://electronics.howstuffworks.com/oled.htm