Judder is a very unpleasant effect that can spoil the impression of watching a movie or TV series. You just get the feeling that the image is sluggish and slow, but it’s not.
So let’s find out what judder is and why it occurs. You should know that most movies are shot at 24 frames per second, which means that the original content has a frame rate of 24 Hz. However, most modern TVs have a 60 Hz display (or even more, but 60 Hz is the most common frame rate).
To combine original content and a 60 Hz display, most manufacturers use frame-adding technology. When the TV adds another 36 frames simply by duplicating the existing 24. The problem is that you cannot divide 60 by 24 to get a whole number.
That’s why manufacturers have developed 3:2 technology, which means the first frame is displayed for 3 seconds, the second 2 seconds and this is repeated throughout the entire movie.
You know, 1 second is a very small amount of time, so most of the time you don’t even notice it and the technology works fine, but if the movie has a fast scene change, you might notice something going wrong. You start to feel like the image is sluggish.
You can get rid of it by activating True Cinema or Filmmaker mode on your TV, if available. The Motion Smoothing feature can also help you, but there is a chance it will create a soap opera effect where everything seems too smooth.
So now you know what judder is and you know how to get rid of it. Personally, I’ve only encountered this effect once, so I don’t think it’s a very common problem.