The result deserves a closer look. It is easier to do so with the "worst" image:
We see that there are twice as many images at 100 Hz, as the smaller gap between two consecutive images shows. However, even if our eyes perceive a lower afterglow, or none at all, there are still ghost images behind the main one, even in the "best" picture at 100 Hz. Even more surprising, the brightness of persistent images at 100 Hz is a bit stronger than at 50 Hz. The above shows this at 100 Hz, and Samsung doesn´t only send twice the amount, but it could also add an inversed overdrive to accelerate the erasing of previous ones.
This system seems to be efficient. Look at the worst cases:
At 100 Hz, the monitor displays one image – calculated and not sent by the graphic card – every 10 ms. To erase it, Samsung sends an inversed tension to liquid crystal cells. The crystals answer quicker, but obviously the end positioning is still a bit inaccurate. The acceleration makes them slightly exceed the targeted position and the result is a lighter tracing of the background color. You can see it in the lighter outline behind objects in motion. This is probably why we seem to see objects singled out so much from their background.
So, with this analysis we better understand why the length of the afterglow shadow, especially due to colors, is shorter. The above image shows that it is half as long.
Another phenomenon adds to this. Each image will be displayed 10 ms at most instead of 20 ms. The intensity of retinal persistence depends amongst other things on the level of brightness and how long it is seen. The lower display time at 100 Hz would reinforce this sensation of lesser afterglow.
