Keep in mind that LEDs and CRTs are two completely different things. CRTs have "phosphor decay," where a pixel hit by the electron beam will gradually turn on a

Keep in mind that LEDs and CRTs are two completely different things. CRTs have "phosphor decay," where a pixel hit by the electron beam will gradually turn on and fade out over time until being refreshed again. For LEDs, they're normally operated using a PWM; turn them off (0% brightness) and back on (100% brightness) fast enough and people don't really notice that instead of 50% constant brightness, they're getting 0%, 100%, 0%, 100% ... with a duty cycle of 50%. You can see that even with LCD monitors. LCD monitors with a LED backlight will have a display refresh (ie. how often the pixels can change color) of, say, 60 Hz but the LED backlight might be run at 4 to 8 KHz (ie. how often the whole backlight turns on and off to give different brightness levels).