LCD TV

[Sigurd]

I am currently helping my wife in getting my in laws a new LCD TV. They aren't the richest people so the budget aren't that big.

The thing is: He (my father in law) read in some magazine that you at least need a 100 Hz TV. Anything below is crap.
As far as I understand the concept, the difference between the old TVs with CRT interlaced technology and the new progressive LCD technology, is that Hz doesn't matter as much in LCD technology as it does in the CRT technology.

However there are 100 Hz LCD TVs out there and I have to explain why progressive signals don't really depend that much on high refresh rates. When thinking about it - I realize that my current knowledge about this is not that great.
I know there is this thing called refresh rates which figures in milliseconds. But how this combines with the 100 Hz progressive screen line refresh rate is unclear.

We are currently looking at two TV screens : a 40 inch Samsung at Full HD (LE40B530) and a Sony 37 inch 100 Hz Full HD (KDL-37W5500). Both just under budget.

Any tech heads out there who could enlighten me about this 100 Hz vs 50Hz/60Hz issue on LCD screens? I have heard it is a Hype to want 100 Hz LCD TVs. You don't really need it.