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| Thanks to the 120Hz display frequency of the LT-47X899, we found that motion on the screen was smooth and didn't show much evidence of glitches. Even scenes with lots of movement (such as the jerky, hand-held action sequences of Cloverfield) were well reproduced and had plenty of detail still visible. |
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Motion Smoothness (7.25) 
The LT-47X899 is one the of the new generation of displays that refresh the screen at 120Hz, twice as fast as older models. And this was borne out in our testing of motion on the screen; we saw smooth, clean motion that preserved the detail of fast moving objects. We test using a number of DisplayMate screens that use photos and color charts in motion, and all of these had smooth, clean motion. This was also borne out in our informal testing with a number of movie scenes that involve lots of motion; with both a 1080p and a 1080i video source, sequences such as the first monster attack in Cloverfield and the mall chase sequence in Blade Runner had very smooth motion.
Motion Artifacting (7.50)
Displays often use processing to try and make motion seem smoother, and these can often lead to glitches in the video. However, we didn't see much evidence of problems in this respect with the LT-47X899; in our tests using photos, color charts and movies, the smooth motion we saw above was without consequences such as ghosting (where movement leaves a trail), streaking (where the processing causes streaks or blotches of color) or advancing (where certain colors seem to move quicker than others because of differences in the response time for the LCD elements). We did see some slight issues with a 1080i source; the movement of objects on the screen was not as solid, and some high contrast objects had a slight jitter that was caused by the display de-interlacing the video
3:2 Pulldown & 24fps (7.0)
3:2 pulldown refers to the process where the display tries to re-create the 24 frames per second look of films. Most movies and many TV shows are shot at 24 frames per second, but then processed and transmitted at the 29.97 frames per second of conventional TV. This conversion process leaves traces in the signal, and many TVs can spot this and try to re-create the 24fps look of the video, using a process called inverse telecine. This, in theory, should give you the same look as film, but only if it works. We use a Silicon Optix HQV test Blu-Ray disc to test this as it offers a test video that highlights if the process works or not. The LT-47X899 did a middling job of detecting and displaying the 3:2 pulldown; it detected that the source video needed processing, but didn't do a great job of rendering this using the inverse telecine onto the screen; the resulting video was jaggy and blocky, as if the display was processing the screen in distinct chunks. This meant that the video had a blocky, grainy look, almost like a poorly compressed online video.
The LT-47X899 was able to display a true 24 frames per second video from a high-end video source such as a PlayStation 3 playing back a Blu Ray disc; it detected the signal correctly and did a decent job of playing back the video smoothly.
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