It's something most people just call 'blur'. This is an example:
It's a very low res video but it shows pretty well that during the white test screen patter, one display shows the lines moving whereas the other just doesn't keep up and blurs the image to a point where you basically no longer see the lines.
This happens in all TVs to a certain extent and deteriorates the image quality. Think about moving the camera (not even too quickly) in a game, say with lots of detailed trees in the background: some TVs will retain more detail and others will blur it and show a green mess.
It's a very low res video but it shows pretty well that during the white test screen patter, one display shows the lines moving whereas the other just doesn't keep up and blurs the image to a point where you basically no longer see the lines.
This happens in all TVs to a certain extent and deteriorates the image quality. Think about moving the camera (not even too quickly) in a game, say with lots of detailed trees in the background: some TVs will retain more detail and others will blur it and show a green mess.