So you don't need to pay, they claim
1,307 vertices traced at 12.8 frames per second, which corresponds to 16,700 points per second
and
a particle velocity of 164?mm/s
Which they believe can be increased by an order of magnitude, so its got some scaling possibilities.
Thanks for the additional information. I haven't spend too much time to look at other places. I had the link to the Nature article and the link to the video. And found it fitting in here pretty well.
That 16.7kpts/s sounds impressive, but that only allows line art graphics. Even a magnitude more won't help much. If you want to display a plane of 100pixel by 100pixel at 25frames you're already at 250kpts/s. And my gut feeling is that's probably the limit you can force through the air using ultrasonic waves.
And probably line art graphics are the only usable style that display might be used for. As you can't
display opaque areas. For example displaying a sphere you see both surfaces. So a volumetric display of Princess Leia Organa of Alderaan would look rather odd.
Don't get me wrong. That's really impressive what they've done there.