This document describes a Radar Display Unit (RDU) that is designed to replace CRT-based displays with a lighter and more compact unit. The RDU uses an active matrix LCD with LED backlight to display radar information in full color. It has software-configurable buttons, runs Windows XP on an x86 CPU, and is compatible with APQ-159 radar systems. The RDU is tested to various military standards for reliability under temperature, vibration, shock, and environmental conditions.