MicroLEDs produce light by the same process that their larger LED cousins use: When electrons and holes in a semiconductor material recombine, photons are emitted. But compared with conventional LEDs and other light emitters, microLEDs are much brighter—an advantage that has drawn the interest of makers of augmented- and virtual-reality headsets, whose displays need to compete with the Sun in outdoor environments. On page 30 , Vikrant Kumar, Keith Behrman, and Ioannis Kymissis discuss the manufacturing challenges of microLEDs and highlight display-industry applications. (Image by J. Keisling.)