S17-487 Metasurface Micro-Cavity for OLED Color Purity Researchers at Stanford have developed a simpler and low-cost micro-cavity design for color tuning of organic light emitting devices (OLEDs) for display applications. A micro-cavity is an essential part of OLED display for high color purity. Won Jae Joo Mark Brongersma Majid Esfandyarpour