Did it a second time maybe 30 minutes later and it quickly resolved into spinning wind turbines blades, dozens of them, circling the middle of the screen, in a random circle-ish flow that moved like waves. After a few minute of that, it seemed like I was falling through a warp tunnel with stars connected by glowing arms flashing by, then hands and arms started to reach up from the bottom of the screen and I turned it off.
I just let my eyes relax and didn't really focus on the screen, but when I did focus, that's usually when the unpleasant images appeared.