subject: Projection TV- The World of LCD Projection Television [print this page] Projection TV- The World of LCD Projection Television
These days, there are roughly as many kinds of television sets are there are different channels to watch. Digital, plasma, cathode ray, liquid crystal display, analog, rear projection, high definition and many more types are available; you may even mix some of those types with other types to combine to form just the set that you want. Case in point, an LCD projection television combines a liquid crystal display with projection and big screen.
Most people are familiar with projection technology from going to the movies; the screen works the same way in both technologies. The projection device receives the picture being projected by a light and allows the picture to be viewed by the human eye.
Movies are projected from images captured on a piece of film, with movement occurring because the film moves from one reel to another very quickly, while the projector focuses on a single picture at a time. Since each frame of film shows a slightly different picture, the eye is tricked into translating it into motion.
LCD projection television works in a different way; the image being projected is not a complete picture presented in front of the projector. Rather, the image is being collected from an antenna, cable or satellite at the rate of one line of resolution at a time, and motion is imitated by the rapid resending of lines. The result is a constantly changing picture implicit in the viewer's brain as a moving picture.
A television picture can be either projected from the front of the screen or from the rear. An LCD projection television is made up of a separate receiver or projector unit and screen. The projector can be mounted on a table or ceiling and directed to a special screen that will show the image at its best.
A rear projection tv is a single unit with the projector contained behind the screen. An LCD projection television would be given a small, sharp television picture and the projector will enlarge it to fit the screen. This is like the older cathode ray TVs, which projected a television image on the back of the screen. Except bigger.
