If you're thinking about assembling a home theatre system, you may be looking at large screen televisions as the heart of your system. Projection TV could give you the size that you want -- CRT screens generally top out at 40" (101 cm) or so, and at that size, they are huge and heavy. Plasma screens can be bigger than that and still manageable, but they can be extremely expensive. Projection TV technology can create large screen sizes at a reasonable price. Or maybe you need to equip a room, like a classroom or conference room, for multimedia presentations with a large audience. A projection TV gives you a lot of flexibility and is usually much better than the standard combination of a 35mm slide projector, overhead projector and TV/VCR.
Projection systems are mainly divided into Transmissive and Reflective projection TVs. In transmissive the Picture is produced when the light source shines through an image. While in reflective projection TVS, the light source illuminates the image formed, and this is reflected onto the screen
Presentations have moved from still pictures to animated, thus relying on the digital media. Projectors of more picture quality have been a requirement. Also with the concepts of ?Home theatres? imply for more picture quality than what CRT and LCD projection systems provide.
In the field of reflective projection TVs the recent innovations are Digital Mirror device and Grating Valve technologies. They have been able to produce lager pictures at much higher resolution than the existing CRT and LCD projection systems. Under constant research and designing, these technologies are sure to replace the CRT tube forever.
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