Another technology that may prove even more important is DMD, or Digital MicroMirror Devices. These devices use a minature mirror for each pixel element. Each mirror has an attached lens. In a resting state, a light source is refected off of the mirror at an angle, missing its lens. When a signal is applied, the mirror bends, allowing light to pass through its lens opening.
DMD devices offer very fast response times, lower power consumption and better light throughput.
DMD-based displays could be cheaper to produce than current Active Matrix LCD displays, due to simplified manufacturing procedures. The first commercial projection systems using this technology should be available by the Fall of 1996. Projection Screens One factor that is often neglected in purchasing projection systems, especially portable systems, is the projection screen. The most common surface used is a glass beaded surface, which offers good reflectivity and diffusion. Newer designs embed the glass beads further into a more durable vinyl surface, resulting in fewer problems.