Refresh rate doesn't matter for TFT monitiors because it is a digital technology. The refresh rate is only used for sending the signal to the monitor, it is then turned back into digital data and the appropriate pixels are flipped. There is no refreshing of the entire screen every specific period in the same way as a CRT works.
The recommended refresh rate for most TFT monitors is 60Hz.
EDIT: Too slow trying to dredge up data from the bottom of my brain.
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