[nfotiu]

Originally Posted by Bobblehead

That is a lie right there. Cheap or expensive, all LCDs refresh at 60Hz.

The difference is the circuitry they use to expand the SD picture onto more pixels. Better algoritms = better circuitry = better picture. Those higher end chips that do the work cost a little more and are found in the higher end HDTVs.

The response time can vary.

Moving pictures on a CRT TV do not exhibit any sort of "ghosting" because the CRT's phosphor, charged by the strike of electrons, emits most of the light in a very short time, under 1 ms, compared with the refresh period of e.g. 20 ms (for 50 fps video). In LCDs, each pixel emits light of set intensity for a full period of 20 ms (in this example), plus the time it takes for it to switch to the next state, typically 12 to 25 ms.
The second time (called the "response time") can be shortened by the panel design (for black-to-white transitions), and by using the technique called overdriving (for black-to-gray and gray-to-gray transitions); however this only can go down to as short as the refresh period.
This is usually enough for watching film-based material, where the refresh period is so long (1/24 s, or 41.(6) ms), and jitter is so strong on moving objects, that film producers actually almost always try to keep object of interest immobile in the film's frame.
Video material, shot at 50 or 60 frames a second, actually tries to capture the motion. When the eye of a viewer tracks a moving object in video, it doesn't jump to its next predicted position on the screen with every refresh cycle, but it moves smoothly; thus the TV must display the moving object in "correct" places for as long as possible, and erase it from outdated places as quickly as possible.
Although ghosting was a problem when LCD TVs were newer, the manufacturers have been able to shorten response time to 4ms on many computer monitors and around an average of 8 ms for TVs.

http://en.wikipedia.org/wiki/Liquid_...lay_television