REAR PROJECTION TV

A rear projection TV is cheaper as compared to plasma TV and it is a boon for those who cannot afford a plasma TV.

In a rear projection TV the image is reflected and projected on the screen from behind the screen as compared to film projection in which the projector is placed in front of the screen.

ELEMENTS OF A REAR PROJECTION TV

There are five elements involved in the construction of a rear projection TV.

• 1. Projector technology to produce video image.
• 2. Lens assembly for magnifying the projected image.
• 3. A mirror for reflecting the projected image.
• 4. A screen for reflecting the image.
• 5. A sealed box for containing all these elements.

Before going for a rear projection TV lets examine the limitations associated with it:

• SCREEN SIZE
  
  The size of a rear projection TV varies from 42 inches to about 70 inches. Although you can get a 100 inch projection with a home theater project for the price of a 50 inch rear projection TV, but the screen size should fit in your room. If you don't have such a room you can go for rear projection TV.
  
  
• VIEWING ANGLES
  
  These TV have a limited viewing angle. The optimum position for viewing would be directly in front of the screen. If you move either of the sides contrast,color and brightness would fall down. Since the viewing angles are limited few people can watch.
  
  
• REFLECTIONS
  
  Since rear projection TV make use of screen saver it causes glare which degrades the quality of the picture. The only solution would be to remove the screen saver but removing the screen saver would damage the screen which is expensive and fragile.
  
  
• ASPECT RATIO
  
  aspect ratio refers to the ratio of the screen width regard to the height of the image. Rear projection TV come in both 4:3 and 16:9 wide screen format. Most of the standard television come in 4:3 ratio.

While making a choice you should be aware of the advantages and disadvantages of the technology.