The number of LCD and plasma televisions in households seems to be on a steady rise, with their prices gradually dropping, and even middle-class families are braving the option to shell out big bucks and buying large televisions. However, the most stylish models of television sets are still hopelessly expensive for a vast majority of the population to afford. As an alternative to these beautiful wonders of technology, RPTVs, or rear-projection televisions, are often sought by customers. RPTVs combine superior performance with affordable prices
Rear-projection televisions are named so because the image which appears on the screen of the television is actually projected from the back of the screen. It is essentially a reversal of traditional projection technology, where the location of the projector is not behind the screen but in front of it. However, the basic principle is rather identical in both cases.
In case of RPTVs, the nature of five components greatly affect the quality of the television. The first and most important of these components is the projection technology which is being employed to form the image. This can be of multiple types, namely DLP, LCD and CRT. There are some other lesser-known variants, but they are not used much in conventional models of televisions.
The Digital Light Processing (DLP) projection system is considered to be the best successor to traditional CRT-based RPTVs, and it utilizes a special chip called a DMD, also known as a Digital Micromirror Device, which reflects individual light and colour information for every single pixel of the scrren.
Liquid Crystal Display (LCD) projection systems are quite well-known in this age, and they make use of a special LCD chip, which allows light to pass through it. In conjunction with a very bright light source, the LCD chip, which bears a fine mosaic of pixels showing the image. This mosaic composite image is then magnified and reflected upon the screen.
Cathode Ray Tube (CRT) projection systems have been around for the longest, and it involves three individual cathode ray tubes (one red, one green and one blue) are used to project an image, which is then magnified prior to being reflected upon a surface, which in case of RPTVs is the screen. The biggest advantage of using CRT projection systems is that their resolutions can be extremely high. However, CRT systems also emit considerable amounts of radiation, which is why spending long periods of time in front of them is not advisable.
The other components associated with the construction of rear-projection televisions include a lens assembly, used to enlarge the size of the projected video image, a mirror which is used for reflecting the image, a screen upon which the image will be finally projected after it undergoes reflection, and last but not least, the sealed cabinet of the television, which will house all of these components securely.
All of these components are important in their own right. If an inferior lens assembly or mirror is used, the clarity of the image will be greatly compromised. Also, the screen on which the image will finally be projected must also be of very high grade, since unwanted distortions and flaws on it will be glaringly visible. Also, the casing must be of very good quality, with a solid construction, and with each component affixed solidly within it.
When buying a RPTV, audio is also a very important factor. Since the RPTVs have large screens, there is often enough room in the cabinet to include large speaker systems, which can provide excellent audio output.
The high prices of HDTVs are yet to come down considerably, but RPTVs have come through as an excellent option for those who cannot afford them, but like to enjoy their TV shows and movies in style. So, if you are one of them, go get your own RPTV now!