Rear Projection TV
Rear Projection TV - How It Works With TV Reviews
From the time when giant televisions and home theaters were considered luxury items, television viewing at home has undergone dramatic changes during recent times. Huge televisions showing grand pictures is now a common phenomenon in most homes. Though the traditional cathode ray tube (CRT) is capable of producing equally good picture quality, the technology is incompatible to hold the massive screens which are in demand today. Both front and rear projection TVs produce bigger pictures and are found to be suitable for most room sizes and varying budgets.
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How does a rear projection TV work ?
The easiest way to understand how a rear projection TV works is to compare it with the mechanism of a conventional TV. Usually a beam of electrons is fired on to a screen layered with phosphor. At the precise point of contact, called a pixel, it lights up. In fact, when you watch the TV, you are viewing the surface, which the TV uses to create the picture. That is how the CRT TVs get its other name - direct-view displays.
One of the biggest disadvantages of CRTs is because the screen is made of glass. This results in lack of flexibility in terms of size. A glass screen larger than the usual 40 inch diagonal size of a CRT TV, would be too heavy for convenience of use.
Hence the advent of the new avatar in television technology - projection TVs. Basically projection TVs makes a small picture large by using a beam of light to display it.
Projection TVs can be of two types - front and rear projection.
A projector and a separate screen are needed for a front projection system. Somewhat like what you see in a movie theater - where the projector projects images onto a screen that is placed in front of it. You could have a screen or even a flat wall would be sufficient for display.
With rear projection TVs, the images are displayed on the back of the screen and the projector as well as the screen are one composite unit.
Most TVs available today, where the diagonal measurement of the screen is more than 42 inches, are rear projection TVs. Imagine a box with a translucent screen. A video image is created in side the box which is displayed on the inner surface of this screen with the help of mirrors and lenses. All rear-projection TVs have high definition displays which make use of the latest digital HDTV broadcasting system. They are capable of producing big-screen pictures which are excellent in terms of quality and clarity. In-built HD tuners are also a common fixture these days, as also its ability to capture digital cable without a set-top box.
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