In the past few years the response times in LCD's have gotten better. Down from like 32ms (early 2000's) to 16ms (2005) to 8ms (2006) to Sharp being the only one to 4ms by 2007.

My question is how come panels like the new Samsung 81's and the new Sony XBR 4 and 5's are still 8ms?

And does anyone know when any LCD TV's (not computer monitors) will approach the 2ms standard which is close to that of the old CRT?

I know the whole thing these days is the talk of 120Mhz technology, but it seems as though response time lowering has stopped.

I bring up this topic because I was at Circuit City yesterday and while viewing the terrific picture of a Samsung 4065F I noticed a some pixelation and distortion of fast moving scenes (though it was the best LCD picture I have ever seen). And yes I am aware that the panel does not have 120Mhz technology.

A few points:

1 - it's not 120MHz technology, it's 120Hz technology. 1 second divided by 120 gives 8.33 ms per frame.

2 - active matrix LCD is fundamentally limited in how fast it can refresh

3 - the spectrographic color change response time for LCD pixels is not uniform. ie: going from black to white, grey to grey, red to blue, aren't uniform & thus you'll see ghosting...period. Generally the "6ms" response times you see quoted are for one type of pixel change only.

LCD cannot and will not ever provide the performance (color, response, viewing angles) of CRT. Stop hoping.

In the past few years the response times in LCD's have gotten better. Down from like 32ms (early 2000's) to 16ms (2005) to 8ms (2006) to Sharp being the only one to 4ms by 2007.

My question is how come panels like the new Samsung 81's and the new Sony XBR 4 and 5's are still 8ms?

And does anyone know when any LCD TV's (not computer monitors) will approach the 2ms standard which is close to that of the old CRT?

I know the whole thing these days is the talk of 120Mhz technology, but it seems as though response time lowering has stopped.

I bring up this topic because I was at Circuit City yesterday and while viewing the terrific picture of a Samsung 4065F I noticed a some pixelation and distortion of fast moving scenes (though it was the best LCD picture I have ever seen). And yes I am aware that the panel does not have 120Mhz technology.Refresh and response are two different metrics.

Refresh = time between successive frames
Respone = time it takes each LCD pixel to fully respond to a voltage chage.

You are referring to response times. The reason for the supposed stop in response time declines is because LCD manufacturers have realized that having an ultrafast repsonse time provides little to no benefit to the consumer once they are below 8ms or so. In other words, the blur produced by 8ms or less LCDs is caused by something else. Making the respone even .00001ms would not solve this.

The reason for this is due to how LCDs display light over time. Unlike plasma or CRT, LCDs hold the pixels "on" for each refresh cycle. Since our eyes tend to follow movement the longer the pixel stays "on" the more blur is created on our retina. This is why 120Hz was developed - to shorten the time each pixel is "on".

for a more detailed explanation refer to the following link:

link (http://archive2.avsforum.com/avs-vb/showthread.php?t=760849&highlight=120Hz)