The Glade 4.0

Have you actually seen the difference between a 60 Hz LCD and a 120 Hz one? I have, and I can tell you that there is definitely a noticeable difference, especially in scenes with a lot of movement. I watched a scene from the Iron Man Blu-ray on my friends 120 Hz LCD, and it looked much better than when we watched the same scene at 60 Hz. In regular, static scenes, it wasn't as noticeable, but it really made a difference when there was a lot of action. Again, they wouldn't be pushing so hard to increase the refresh rate of the LCD TV's if there wasn't an actual problem.



Once again, I'm guessing you haven't seen one in action or you wouldn't say there's no apparent difference between a 120 Hz and a "theoretical" 24 Hz LCD. Either that, or you don't watch much football.

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I'm referring specifically to Blu-Ray playback. Blu-Ray frames cannot refresh any faster on a faster Hz television--no matter the refresh rate of your TV, you're getting 24 redraws per second from a Blu-Ray movie disc. It's possible your sports broadcast has a higher framerate.

There is also a difference between refresh rate and pixel response time. A lot of manufacturers confuse the two in the labelling. An LCD panel might have a response time of 8 milliseconds. This means it takes a minimum 0.008 seconds to change the image on the screen (because the screen can only redraw as fast as the individual pixels will let it). Now, an 8 millisecond response time allows a refresh rate of no greater than 125Hz. That doesn't automatically mean it's going to be running at 125Hz. In fact, I've never seen a 125Hz television. However, it's also not necessarily running at 120Hz. It may be running at 60Hz with a slightly greater than 8ms gap in between each frame. A 240Hz TV is impossible without a pixel response time of around 4ms. But a 4ms pixel response time (with the corresponding 12ms of static display time) would also help the image quality of a 60Hz television.

Taking longer to change an image is going to hurt image quality more than the actual refresh rate, and it's very possible on some 60Hz televisions that they're using cheaper panels that have a 16ms response time. You know that any 240Hz television requires at most a 4ms pixel response time, while with a 60Hz television, unless they specify, you're not sure what you're getting.

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Yes, but not by much. Standard NTSC broadcast television is 29.97 fps.

That's an odd rate. There's enough of a variance there from 30fps that it will cause occasional juddering at any refresh rate (60,120 or 240.) To fix it, you'd need 59.94Hz, 119.88Hz, or 239.78Hz.

Of course, any juddering there is so infrequent as to be unnoticeable. It's not like a 60Hz TV playing 24fps content from a Blu-Ray, where every second frame has a 50% longer sustain time.

Regardless, I found a website that explains what I'm talking about here:
http://www.practical-home-theater-guide ... -time.html

"Pixel Response Time" is the main cause of these motion/action blurring and ghosting effects you guys are talking about. This is not directly related to Refresh Rate -- except that higher refresh rate televisions require faster response times. A modern 60Hz LCD can and sometimes does have the same pixel response time as a faster 120Hz LCD, however.

Regardless, juddering in Blu-Ray playback alone is a reason for the 120Hz televisions to look nicer.

_________________
Well Ali Baba had them forty thieves, Scheherezade had a thousand tales
But master you in luck 'cause up your sleeves you got a brand of magic never fails...
...Mister Aladdin, sir, What will your pleasure be?
Let me take your order, Jot it down -You ain't never had a friend like me
█ ♣ █

Black and white broadcast *was* 60Hz, to match the power grid in order to prevent beating.

The addition of color required a slight (.1%) reduction in framerate in order to prevent interference between the color data and the sound signal.

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Why don't you calculate the error tolerance for a 30Hz display if you assume a 0.1% margin of error. See what you get.

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120 and 240HZ look extremely fake to me. It makes a nice blu-ray film look like it was shot on someone's video camera. HD sports and video games look great in 240 though. Also, in response to Talya's refresh stats, my TV stats list my refresh as 2.4ms.