How it Works1 min ago
domestic electric supply
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Good grief. What clock s[eed speed does your computer run at? At a rough guess it's several hundred thousand times faster than 50Hz.
When connected to a UK TV signal, you are not going to get a refresh rate of more than 50Hz, as that's what it's broadcast at. You may get a slightly sharper picture due to the improved electronics, but the real reason for 100Hz TVs is future-proofing. Whenever High Definition TV arrives in the UK (3 or 4 years?), it is supposed to be broadcast at 100Hz. However, by that time the specs might have all changed again!
Further to finex's explanation, the 100Hz refresh rate was developed in the 80's and uses a digital process to remove picture flicker from analogue broadcasts. As such it is not directly linked to HDTV which is actually an increase of the scan lines used from 625 (for PAL) to 1080 but, of course, a digital signal could utilise this increased update frequency.
I would have replied quicker but my PC only operates at 50Hz.