Without using interframe creation algorithms, all flat panels (sample&hold type) suffer from judder when displaying 24Hz film. This is simply inevitable - each frame is staying static for ~40ms, but the eye is moving during that time. So you have inverse motion blur on the retina, plus double-images due to retina persistence.
(And blackframe insertion is mostly ineffective at such low image frequencies - it would only work out if you would accept visible flicker, like old CRT tubes.)
To minimize this unwanted judder (not the 24Hz judder itself, but the inevitable side-effects that happen on the retina), interframe creation is a must.
The trick to minimize the judder while not creating the dreadful "video-look" is rather simple: don't make full-vector interpolation, but only fractional. Say you have 24fps film, and a 120Hz TV panel. The "obvious" interpolation strategy is to create new interframes at 20%, 40%, 60% and 80% time positions. This is full-vector interpolation, very smooth, and ... looks like video, not film.
Using only fractional-vector interpolation, interframes are created at e.g. 12.5%, 25%, 37.5% and 50%. Et voila. The panel<>retina related judder is vastly reduced, but the
observed characteristic still is "film".
This works pretty good on TV sets capable of at least 120(100) Hz physical refresh rate. With PC monitors (still) mostly limited to 60Hz, this strategy can not be employed at its full strength.