Most newer flat-panel TVs have a special mode for watching films (i.e. movies that were filmed on real film, not digitally "filmed" movies and TV shows) which can eliminate the unnatural smoothness you're experiencing. Movies have been filmed at 24 frames per second since the beginning of Hollywood. TVs have a faster display rate -- you say that yours is 100Hz which means you must be in Europe or another part of the world that uses the PAL video system. The actual frame rate of PAL is 25 frames per second, so the TV manufacturers quadrupled the rate your TV displays at, mainly to improve the viewing experience when watching sports and other high-speed action, but it can destroy the illusion of watching a film as you do at a theater. If the 100Hz figure was a type and your TV is a 120Hz model, it's the same situation but for the NTSC video system -- the 29.97fps quadrupled to a rounded off 120Hz.
Look through your instruction manual or go online and see if there is an option you can turn on called Film Mode or something similar, or something which references the 24fps frame rate. If your TV does not include the option to display at 24fps for film content, then you're stuck with what you're looking at right now. I have never heard of that brand of television, but the cheaper models may not include that feature.