Researchers at the Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology have developed the world's first color OLED microdisplay with ultra low power consumption. Those can be used for information we need right in front of our eyes at all times, like with smart glasses and other wearables, but have so far all been monochrome. By cutting the pixel size in half and utilizing CMOS technology, the Fraunhofer scientists have managed to deliver an OLED microdisplay that can show a mixture of green and red colors for the first time.
https://www.notebookcheck.net/Fraunhofer-develops-the-first-color-OLED-microdisplay-for-smart-glasses-helmets-or-other-wearables.587755.0.html