At the time of posting this, the DJI Phantom 3 Professional and DJI Phantom 3 Advanced does not have an HDMI output on the controller. Fortunately there is now an HDMI upgrade for the Phantom 3 controller and you can find it by clicking here. This allows the connection of an HDMI display or many popular FPV glasses! I found it to be very excited that DJI decided to make this option available, as I feel that the Phantom 3 Professional is currently the best drone on the market today and that was an option that many people wanted.
DJI Phantom 3 HDMI Out Upgrade & FPV Glasses