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Old 11-28-2012, 06:35 AM
proppat proppat is online now
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  • Oct 2009
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Crakarjax touched on this, but there's a ton of mis-information floating around about 120 and 240Hz TVs. We need to stop throwing around bad information so we can actually help each other make informed choices.

1) 120Hz is a TV spec, not a software setting. A 120Hz TV shows 120 frames per second (fps). With a 24fps movie, it will display each frame 5 times consecutively. A 60Hz TV shows 60 fps. A 60Hz TV relies on 3:2 pulldown to cram a square peg in a circle hole (making a 24 fps movie display on a 60 fps screen...if you're not keeping track, 60 is not divisible by 24). Basically, every third frame is tripled instead of doubled.

2) The "soap opera" effect is a setting in the menu of some (not all) 120 and 240Hz TVs. Common names are Motion Plus, True Motion, "120Hz mode," etc. Instead of showing each frame 5 times, it will interpolate frames (i.e. guess) to create new information that doesn't exist in the source data in an attempt to smooth out motion. This fills in the gaps between the "real" frames in the movie to produce that weirdo "super smooth" look.

3) The chances are very low (if not totally non-existant) that this is a true 240Hz display. Instead, it's most likely a "240Hz effect" tv. The difference is that a 240Hz TV displays 240 fps while a 240Hz effect TV shows 120Hz, but simulates twice the frames by quickly strobing backlighting to double the perceived frames. That being said, there's no real advantage to 240Hz displays until we have a) an HDMI spec that supports 48 fps video and b) 48fps Blu-Ray players.

4) All this 1,000,000:1 contrast ratio junk is marketing fluff and not based on anything measurable in real life. Manufacturer's can whip whatever number they want on a TV as there is no standard.

In short, it's not your fault you don't understand 120Hz technology because the tech industry has been extremely misleading. As there's no immediate benefit of 120Hz panels vs 60Hz panels while browsing TVs at stores (even though 24fps video most definitely looks better on a 120Hz TV), the "soap opera" effect became the selling point to distinguish 60Hz from 120Hz. And, honestly, for some things the "soap opera" effect isn't that bad. Just realize that it's a software feature that is made possible with 120Hz panels, not the benefit of 120Hz over 60Hz.

Last edited by proppat; 11-28-2012 at 09:05 AM..
11-28-2012, 06:35 AM

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