Originally Posted by pred1973
IR = Image Retention. Image Retention is when a residual image remains after viewing. Basically a static part of the image (like a station logo, ticker, or HUD in video games) causes an uneven wearing of the phosphors that remains after the image has changed. If you are watching 4:3 material 95% of the time, the phosphors on the sides of the screen will age very differently from the rest of the screen, and over time you would begin to notice that when watching 16:9 material the sides of the picture looked different from the middle portion.
This is inherent in the way that a plasma tv generates light, in that there are tiny little cells (pockets) that contain phosphors, an electrical charge passes through the phosphors which causes the phosphors to "glow". A LCD on the other hand uses bulbs to generate light, that light passes through essentially tiny little prisms (not really prisms but Liquid Crystal Diodes but the principal is similar) to refract the light into colors. There are no lingering effects with a LCD displaying a static image, where-as with plasma there can be to a varying degree that depends on many factors, but depending on those factors it can be very noticeable.
For those of you in the forum who feel the need to correct me, please understand I am trying answer the question in a way that the person asking it could understand, and I am assuming they are not familiar with current tv technology. Sort of a quick, dirty answer if you will.
Thanks so much for the great description. I appreciate you taking the time!
So here's a question for everyone. Like I said, my wife and I have NEVER yet owned a flat screen...we're still on a CRT. We are on Dish Network and have no plans to change that. We will also have Apple TV to watch Netflix, iTunes Movies, etc. Most of our viewing will be through these two methods. But the majority of our viewing will be coming off of Dish.
Because we've never owned a flat screen, we don't know the answer to the following question: Is most of today's programming that is coming over Dish (ie, CNN, HGTV, BRAVO, ESPN, ABC, NBC, CBS, etc etc) broadcast in a 16:9 format or is there still a considerable amount broadcast in 4:3? My understanding was that nearly all of today's programming is HD, and I thought that meant it was 16:9. Am I under the wrong impression? If we are watching mostly these types of "cable/Sat" channels, would we see bands a lot of the time that would force us to be concerned with IR?
Thanks again, everyone...you are really being helpful to me!