Comment by mrob

It's to reduce sample-and-hold blur. Modern displays typically produce a static image that stays visible for the whole frame time, which means the image formed on your retina is blurred when you move your eyes. CRTs instead produce a brief impulse of light that exponentially decays, so you get a sharp image on your retina. Blurbusters has a good explanation:

https://blurbusters.com/faq/oled-motion-blur/