I recently answered a similar question... I completely understand why this is confusing. Let me help answer this question again....
There are currently no source signals that deliver 120HZ and no plans to make one. Signals are either 24, 30 or 60Hz. An LCD HDTV with 120hz capability is upconverting the signal to 120Hz to address motion blur on an LCD TV. A 120 Hz TV is upconverting a lower Hz signal. The information window that you are seeing describes the characteristics of the input signal but does not describe how the television is adapting that signal. To get an idea of what this would look like without 120Hz technology, you can turn on a demo for ?Auto Motion Plus? (Samsung?s name for this technology) in the menu. Just go to ?Picture?->?Picture Options?-> ?Auto Motion Plus? and set it to ?Demo?.
This does not mean a 120 HZ TV doesn?t improve your picture because it does. 120hz TVs minimize motion blur found on standard LCD TVs. It?s just confusing because of how they labeled it. If the industry simply called it something like ?Auto Motion Plus? or ?LCD Motion Smoothing?, it might be less confusing.
If this has been discussed previously, I did not find it so please be patient. The LN52A650 is a 120Hz refresh rate television, however when I click the 'info' button, a display window appears which has the resolution and and frequency. I have only seen the frequency show 60Hz and 24Hz. Why doesn't is show 120Hz? I have verified that the picture options is set to 'medium'. Am I misinterpreting that freqency as a refresh rate versus input frequency?
btw, I recently purchased the Sammy to replace an SXRD (currently in the the shop for it's 4th time in two years), and am elated at the quality of the Sammy picture. Zero buyers remorse!!!