Deciding which HDTV to buy has a lot to do with the size and light levels of your room. If your room is large and dark, you may opt for a projector, as you'll get the most screen for your buck that route. If your room is very bright, you'll want a brighter HDTV so the picture isn't washed out by sunlight.
Plasma holds the edge in contrast ratio and refresh rate, and for a long time, it was the only way you could get an HDTV over 42 inches. Now LCD panel technology has begun to eclipse the Plasma market, especially as LED backlighting becomes better and allows for thinner screens with lower energy demands. With LCD/LED sets up to a 480Hz refresh rate, they hold their own against Plasma sets in terms of fast motion performance, use less energy, and perform better in environments with lots of light.
If you have a large dark room, by all means consider a projector. While bulb life is significantly shorter than LCD or Plasma life with bulbs often costing hundreds of dollars to replace, a new wave of LED lit projectors is rendering that objection obsolete, making projectors a very compelling value proposition for those who want a large screen and don't mind waiting a couple of seconds for bootup.
The most talked about future HDTV technology is OLED, or Organic Light Emitting Diode. OLED technology manages to combine the best of both LCD and Plasma by having extremely high contrast, extremely thin displays, and low power consumption. Sounds too good to be true, doesn't it? Its weakness is its operating life span, which while being improved everyday is still too low for consumer consumption at large screen sizes.
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