Type of video display using liquid crystals that change their light admittance (how much light they let pass through) when an electric current is applied. CD projectors place a powerful light source behind the crystals. Electric current is applied to the crystals to block light in varying degrees. The light is broken up into the three additive primary colors (red, green and blue) and each color of light is passed through the liquid crystals. The crystals let light pass in certain quantities in certain areas to create a visual image. This image is then projected through a single lens (as opposed to three lenses on a CRT projector) and directed at a reflective screen. The light is reflected off the screen creating a cohesive image. ront projectors based on LCD technology are easy to set up (simply set the projector a proper distance from the screen, plug in a source component, and adjust the lens’ focus). They are also fairly lightweight and easy to move around, and they are relatively inexpensive for a large image size (compared to CRT projectors). CD projectors do not produce a good pure black like CRT projectors. They also have a tendency to have a “screen door” look where a viewer can make out all the individual pixels formed by the liquid crystals. This can be an annoying effect, especially when viewed too close to the screen. Also, LCD projectors are not able to accept external line doublers or line quadruplers nor can they project HDTV quality images (at present) with their requisite high resolution (the resolution of any LCD devise is limited by the number of liquid crystals it uses).