Technically, the term
judder was introduced to explain a phenomenon that occurs when movies and other film sources are converted for home viewing using 3:2 pulldown, which uses 4 frames from the original to create 5 interlaced frames in the output. As a result, 3:2 pulldown shows odd frames for 49.98 milliseconds and even frames for 33.33 milliseconds. This mismatch of timing produced a jerky effect that was eventually dubbed as
judder.
In Spring 2007, some owners of xx64, xx54, and xx34 Samsung Plasma TV's adopted the term
judder to explain a sometimes annoying problem present in this family of PDP's. This particular visual flaw appears when horizontal scrolling
news tickers on news, sports, or financial stations are displayed. Specifically, the
news ticker starts and stops in small jerky motions instead of moving smoothly. Some owners call this "jumping ticker" effect "tudder," short for
ticker judder, to differentiate the ticker judder effect from true
judder. Samsung plasmas have no reported visual pulldown
judder problems.
To visualize the ticker judder effect, imagine rolling along in your automobile at 10 miles per hour while tapping your foot on the brake pedal. Although the car will continue to roll along, passengers in the car will quickly become annoyed by the constant jerking of the vehicle. The annoying jerky motion of the
news tickers in these Samsung models affects some people so much that they return their TVs in exchange for another model or manufacturer. Others, however, are completely unaffected by it.