A microscopic version of the OLED displays found in modern smart-phones can be used to control the membrane current in genetically modified cells. HEK cells expressing different versions of the optogenetic construct Channelrhodopsin were grown directly on the surface of an OLED microdisplay and were found to respond to the light provided by individual pixels of the display. The work was carried out by Dr Anja Steude and was in collaboration with Dr Emily Witts and Dr Gareth Miles from the School of Psychology and Neuroscience.
Find the paper at http://advances.sciencemag.org/content/2/5/e1600061.full