What is LCD Projector?
| Digital LCD projector |
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LCD panel and light source combined into a single, portable unit. Considerably more powerful than a panel. Many LCD projectors incorporate features like zoom lenses or cordless mice to simplify operation. The type of projector refers to the type of display technology used on the projector. LCD projectors are the standard, with polysilicon being of a higher quality than the standard LCD active matrix display. "Digital Light Processing (DLP)" and "Light Valves" are the newest forms of projector technology. DLP's are considered to have brighter images, as well as superior video quality, than LCD's. Light Valves, being very powerful and bright projectors, tend to be found on the largest models (and most expensive), such as those used in auditoriums and theaters. Most multimedia projectors create their images by aiming bright light through small LCD panels containing a grid of thousands of "gates," each of which can be opened or closed to control the brightness and color of light at a given pixel on the screen. Since the panel grid blocks some of the light, this is an inherently inefficient process. However, Digital Light Processing (DLP) eliminated this inefficiency. Instead of LCD panels, DLP relies on small chips that contain arrays of tiny mirrors, which can be moved to control the brightness and color of light at a given pixel. This arrangement allows nearly all of the light output to make it to the screen. One criticism of DLP stems from the fact that the mirrors reflect all light, making it a challenge to keep the color black dark enough to provide high-contrast images. |
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