The truth of the matter is...
Response rate should always be measured in 'rise and fall', that is: how quickly a pixel can illuminate to it's peak luminescence and then deplete before refreshing with its next required color.
Some mfr's are now advertising a response rate that calculates 'grey-to-grey'...this is NOT an accurate representation of true refresh rate. Most LCD panels have a native refresh of 8ms. Compnaies like Sharp will advertise a r/r of 4ms, or with their gaming panel a r/r of 5ms. Typically acheiving these refresh times requires the use of 'add-on' video processing. Sharp's nick name for the boosted r/r on their gaming display is 'Viper Drive' technology. Even the Sharp set that advertises a 4ms response time has an asterik in the tech spec's that states this r/r can only be acheieved if 'Fine Motion Mode' is enabled...to me this is a head scratcher, I'm a little weary. Look for LCD panels in 2007, 2008 to have a native panel r/r of 4-6 ms's.
To answer your question...LCD's do not, will not, cannot--burn in--period.
Plasma's have per-pixel illumation and thus better picture truity from all viewing angles. They also typically create (when properly calibrated) a more 'realistic' looking image. LCD's suffer from the use of false contouring and the like, which often leads to sharp yet 'digital painting' images. Black level is up for grabs depending on the set...although neither at this stage do a suberb black. Plasma's get the slight nod because each pixel is individually lit, and therefore not subject to an ever-present backlight as is the case with LCD. Look for better contrast ratio's (100,000:1) in the coming generations to cure that 'black level' issues most current gen sets experience. Interesting to note that Samsung just released a prototype wherein their LCD panels are backlit with LED's that can turn on an off, therefore allowing for a much deeper black resulting from the absecnce of backlight when the LED is off.
In the end for pure picture quality I would recommend Plasma...don't concern yourself too much with resolution, it actually ranks number 3 or 4 on the ISF's overal video quality scale. There are more important things such as color accuracy/reproduction etc. A 50" 1365 X 768 720p native PDP like the Pioneer for example will do the job amazingly, and also r/r is never an issue so you can enjoy sports, action moves and video games without any discernable ghosting.
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