I’m powering a Photon & 64x32 pixel LED Matrix display from a 2 amp 5v USB power supply just fine, but I’m not lighting up all the pixels at once either. I’m displaying Time, Date, Weather, and Crypto price data in a constant loop.
So depending on how many LED’s you want to light up you could be able to get by powering everything from a 2 / 2.4 / 3A USB power supply without any problems. You just have to test the current that’s consumed when displaying the data you plan on displaying.
I was actually surprised at how little power the display was consuming for my application, it was a few hundred MA, not even close to 1A. I was thinking that it could run off a smallish battery all day without any problems. Just depends on how many LED’s you need to light up for your application.