Unlike Sony, Avegant and Royole's offerings, TCL has shrunk the technology into a pair of relatively svelte sunglasses with a polarizing filter on top. Sound comes out of speakers embedded into each arm, and the headset connects over USB-C to a compatible (TCL) phone. Rather than this being a device that you only use in the comfort of your home, TCL envisages this as something you could wear on the go, or on a train.
The two displays over your eyes are opaque enough for you to watch a movie in relative comfort, but around it everything is semi-transparent.
See the full story here: https://www.engadget.com/2019/09/07/tcl-personal-cinema-visor-prototype/