Plessey Semiconductors Plessey is a UK-based working on MicroLEDs based on GaN-on-silicon technology. Plessey operates 150 mm and 200 mm wafer processing facilities to undertake design, test and assembly of products. The company provides illuminators for display engines (Digital Micro-mirror Device DMD and LCOS) and full-field emissive microLED displays that combine very high density RGB pixel arrays with high-performance in-house developed CMOS backplanes to produce high brightness, low power and high frame rate image sources for head mounted displays (HMDs), Augmented Reality (AR) and Virtual Reality (VR) systems. Plessey Semiconductors