To finally just play HD files (MKV gender) on an HDTV. You just do a little manipulation to avoid jerks. It is necessary that the resolution of your file is the same as your TV. If you have a 720p file must be set in preferences Monitors system 720p. By default, the MacBook provides the highest resolution available 1080p for example.
Note of course that this adapter only transmits the image. For 5.1 sound, you need a mini-toslink adapter.
And then necessarily to work very comfortably with a giant monitor from your mobile favorite.