projection tv

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projection tv let me rephrase that.

02/20/2007

I had always assumed that the cathode ray tube television was the only form of television around. My family ha always used a cathode ray tube television and the first television I bought, was also a cathode ray tube one. So imagine my surprise when I heard about something known as a projection TV. I mean, I was no stranger to projection, having been a cinema buff for as long as I can remember. As far as I was concerned, projection had a lot to do with throwing the images, through a magnifying glass in a dark cinema theatre. This is the connection under which I had heard of projection and projectors. But projection TVs? This was something new and alien to me. So imagine my surprise when I discovered that projection TV, as a category of television has been around for a while now!

Go ahead and relax and try to take in every word I'm about to tell you.

In conventional TVs, the technology used is based on charge, cathode ray tubes and electrons, which when they pass through the cathode ray tube, are capable of forming an image on a glass screen. These images are formed as pixels in three basic colors, which can combine to give off millions of colors. While the technology itself has been fine tuned and developed through the ages to give us great television monitors, there are certain limitations to what the conventional cathode ray tube television can do supposing that.

For one thing, being built of glass, the screen of the cathode ray tube or conventional television has a size limitation. Most conventional televisions which use the cathode ray tube technology are less than 42 inches in size. This size is not the height or width of the television, but the diagonal distance between one end and the other. So, the biggest conventional television you can have is around 42 inches. Also, because the image is formed within the confines of the size of the television box, it is smaller and difficult to manipulate in the beginning.

This is not the case with projection TVs. While the basic principles of image formation are the same, the projection TV uses the projection principle that is used in regular cinema screens. The basic image in a projection TV is formed using a conventional cathode ray tube. Of late, the more useful and infinitely more manipulated liquid crystal display technology is being used. Whatever be the image creation system, the innovative feature of the projection TV lies in the ability to project the image. The smaller image formed is projected onto a larger screen located wither within the larger confines of the projector TV or elsewhere. In cases where the projection happens within the size of the TV (which, in the case of projection TVs is much larger than conventional TVs), we get what has come to be known as the rear projection or reflective projection television. In cases where the projection happens on a larger screen located outside the physical confines of the television box, we get what is known as front projection or transmissive projection. Both kinds of projection TVs are available in the market and which one you choose depends and is defined by your specific requirements if you look at it that way.