Why do appear stripes on the monitor screens when they're filmed?

Why do appear stripes on the monitor screens when they're filmed?

Answer

Hi!

Stripes on the screen are caused by the different refresh rates of the monitor and the tv camera.
So when these two are flickering on the different sync the stripes appear. Sometimes i notice when the monitor is set to 100Hz it can be viewed on tv without problem.
Monitor 100Hz is double of PAL 50Hz so solves it.

For more info go to :
http://en.wikipedia.org/wiki/Refresh_rate

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