Display devices form an important group of devices in the electro industry. With the evolution of high definition TV (HDTV), video conferencing and other advancements in video applications, their importance is increasing. Traditionally cathode ray tubes (CRTs) are used in display devices. But the industry is searching for devices with high resolution and fill ratios that cannot be achieved in CRTs. LCDs can be use an alternative but they are not cost effective. An entirely new type of devices based on Grating Light Valve technology solves all the problems concerning resolution, fill ratio, cost, size and consumption. In addition to this GLV devices can provide digital gray scale and color reproduction. The GLV technology is based on micro electromechanical system (ME technology and can be manufactured using mainstream IC fabrication technology. providing controlled diffraction of incident light, a GLV device will produce bright dark (or even coloured) pixels in a display system. The seminar should cover, 1. Fundamental concepts 2. Architecture of GLV 3. Controlling the GLV device 4. Applying the GLV technology 5. Comparing the GLV technology