Mini DisplayPort is a compact version of the DisplayPort connector introduced by Apple in 2008. Mini DisplayPort is free to license, and in 2009 it was included in the official DisplayPort 1.2 spec. In 2011 Apple and Intel announced the Thunderbolt format, which used the same physical connector, but significantly different protocols.
Screen refresh rate is the number of times an image on any type of monitor or television is reconstructed per second. This is measured in hertz.. (Hz).
Refresh rate is how often the TV shows a new image. Anything above 60Hz is entirely the invention of the TV itself. All modern video is either 24 frames per second (movies and most TV shows), 60 fields per second (1080i video), or 60 frames per second (720p video).