The Slow Mo Guys filmed an old cathode ray tube TV (playing Super Mario Bros.) with an ultra high-speed camera. It struck me that I've always known how CRTs work—the RGB electron beams trained across the screen, line by line, completing a full picture 50 or 60 times a second—but never actually seen the reality of it slowed down. There's something quite haunting about it.
"A CRT can draw Mario's mustache in less than 1/380,000th of a second"
Moving onto a modern 4K TV, you can see not just how much more gets drawn, but how the technology differs: pixels don't fade but stay bright until they are redrawn. The subpixel pattern, however, remains much the same—at least for these sets—albeit with much smaller scanlines.