Tuesday, 30 January, 2007
120Hz HDTVs ‘making movies look as smooth as butter’
120Hz HDTVs are coming to market quick, and according to the Gizmodo website, the technology makes movies look as smooth as butter.
And the reason is that film is 24 frames per second. And just about every movie disc you can buy is encoded in this format. We’re not just talking DVD. We’re talking about HD DVD and Blu-ray, too. The problem is, most TVs run at 30 frames per second. Fitting that 24-frame content onto a 30-frame screen isn’t that easy; the maths just doesn’t compute cleanly. You can’t divide 24 by 30 without filling in the gaps with some junk. That junk causes stuttering in the video. This is a jerky-looking phenomenon that’s particularly noticeable when the camera pans across a scene. The conversion is better known by film and TV wonks as 2:3 pulldown. It spreads out 24 frames into 30 by placing one frame on the screen three times and the next one after that two times, and repeating this pattern ad infinitum.
JVC is poised to beat Olevia to market with sets based on the 120Hz technology and have announced three new high-def TVs that will utilise the higher refresh rate allowing a new image on screen every 8.3ms, which is twice as fast as standard sets. The improved refresh rate is achieved via interpolation. The 32” LT-32L95, 37” LT-37LC95 and 42” LT42LC95 all share 120Hz refresh, 1,366 x 768 resolution, 500 cd/m2 brightness and built in digital tuners.
The sets only 1 HDMI input which isn’t great, 3 composite input sets, 1RGB, 2 FireWire inputs and a SD memory card slot for viewing JPEG images on the screen.
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