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Help Needed: A reason to buy 120hz?

post #1 of 5
Thread Starter 
Hello everyone, yesterday I reached a sort of dead end in deciding which TV to buy.

So a little back-story, a couple months ago I began researching HDTVS.

I used to play Counter-Strike a lot, and back then having a CRT monitor with a high refresh rate was a huge benefit and many people used to run CRT monitors as opposed to LCDs with the 60hz refresh rate.

So after searching a bunch I came up with two TVs, the LG 32LD550 and a Vizio 120hz SV320xvt (a couple months ago Vizio was selling it for 299).

I had learned about the interpolation effect and had seen it in person a couple of times, so I figured if I didn't like it I would just turn it off.

Yesterday however, after doing some final research on the two TVs I was interested in, I learn that all the LCDs (consumer ones at-least) only accept 60hz input....which meant that it would not have been what I experienced when I used to play CS on the CRT.

Did more research and came across a video in youtube (cant post links but search 120hz vs 60hz and it should be the second one down by TEKHD, it is a short vid)

So from what i'm understanding there are 2 ways TVs get to the 120hz.

One is by repeating frames and the second is by producing a frame in-between (interpolation). According to that vid, the guy claims that buy turning interpolation off you get the Cinema effect rather than the Soap Opera look.

Today I called LG and the tech (who didn't seem knowledgeable as she didn't know what interpolation was) said that if I turned trumotion off I will be at 60hz instead of 120hz.

So what this meant to me was, if I turned trumotion off (and it seems a majority of people hate the soap opera effect) then my TV is no better than a 60hz TV.

My first question then is, who is right? The gentleman from the video who says if I turned interpolation off I will still be at 120hz by repeating frames (giving me a better movie experience) or the lady who says that if I turn it off I essentially have a 60hz LCD.

I have understood that interpolation is bad for gaming, as it results in some defects as well as higher input lag due to the processing of the intermediate frames.

My second question then is, if say I turn interpolation off, will there be any benefit (maybe by repeating frames?) to Xbox 360 gaming? The gentleman in the video stated it would be better, but i'm not sure.

My third question is, what does this all mean for PC gaming (using my TV as a monitor) since my PC games run at higher frame rates than my 360, vsync on or off. Will I get any benefit with turning interpolation (lg's trumotion) off.

My fourth and final question is say the gentleman from the video was right, and turning interpolation off and producing 120hz by repeating frames yields a better movie experience. Is that movie experience significant enough to be worth say 300 dollars?

If you have reached this far then id like to thank you for taking the time to read, as well as thank you in advance for any replies you have.
post #2 of 5
Turning off TruMotion on the 120Hz LG does not "revert" it to a 60Hz set. Some sort of interpolation or motion smoothing is always going on whether TruMotion is enabled or not. Lag can be an issue on most 120Hz sets. To get the least amount of lag, you're best off to get a 60Hz set.
Using new generation tv's as computer monitors is problematic for most mfrs. and users, depending on your needs. The tv's are designed primarily for the movie experience, not necessarily as a gaming platform. It's getting better but still has a ways to go.
post #3 of 5
Thread Starter 
Thank you for the reply

For movie purposes, is using a 120hz lg tv with trumotion off just to get the 5:5 pulldown worth the extra cash cash over a 3:2 60hz?

Will the difference be noticeable if say an average Joe looked at the screen?
post #4 of 5
Quote:
Originally Posted by ubermacht View Post

Thank you for the reply

For movie purposes, is using a 120hz lg tv with trumotion off just to get the 5:5 pulldown worth the extra cash cash over a 3:2 60hz?

Will the difference be noticeable if say an average Joe looked at the screen?

That's hard to say. Everyone's viewing requirements and perceptions are different. Getting a tv that will satisfy all of your needs is very difficult. You'll probably have to compromise on something. If you can go to your local B&M and check out some sets that may help you decide. We can recommend but ultimately it's what looks ok to you, not what we say.
post #5 of 5
if u want good response from an lcd, put it in movie or game mode. That will disable all that 120hz BS. Look in the response time post. With all the motion smoothing stuff on you can get way up over 100ms but on some sets with it off you can get down around 20 or below.
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