LEDs in the display (IMAGE) University of California - San Diego Caption These LEDs are part of a grid that is 5 square millimeters. The display in this small version inlcudes 1048 LEDs. Dayeh and his team used their expertise in working with Gallium Nitride to develop a manufacturing technique for high-efficiency LEDs that do not heat up when they light up and do not damage brain tissues. Credit University of California San Diego Usage Restrictions Please credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.