samsung LED and refresh rate question (un55b8000) - Blu-ray Forum

paulfromtulsa · 08-25-2009, 02:46 PM

hello i have a samsung led model #un55b8000. I know that this tv has a refresh rate of 240hz but when i hit the info button on my remote it reads as follows. when watching a bluray it reads 1920x1080p 24hz. hidef channel 1920x1080i 60hz. regular channel 720x480 60hz. my question is what does the 60hz and 24hz stand for and why is it lower when watching a bluray movie? thank you.

callas01 · 08-25-2009, 04:38 PM

Blu-ray movies play at 24 fps(frames per second) so the screen refreshes at 24hz to match the frames per second, so as to minimize and eliminate any judder that could occur. TV/Cable/Sat and DVDs all play at 30 fps, and using the 60hz refresh rate allows for the 3:2 pulldown that most TVs use as the easiest way to do that so it minimizes the judder that can occur.

your 240hz refresh rate is the speed at which the tv refreshes the screen to eleminate motion blur. The reason they use 120hz and 240hz is that they are both number divisable by 24 and 60. So what happens is the screed on a 240hz LCD is that it adds 10 additional frames every 1/24 of a second or 4 additional frames every 1/30 of a second to eliminate "Motion Blur"

you can read this article if it helps you. http://www.soundandvisionmag.com/fea...-it-hertz.html

paulfromtulsa · 08-25-2009, 04:45 PM

Quote:

Originally Posted by callas01

Blu-ray movies play at 24 fps(frames per second) so the screen refreshes at 24hz to match the frames per second, so as to minimize and eliminate any judder that could occur. TV/Cable/Sat and DVDs all play at 30 fps, and using the 60hz refresh rate allows for the 3:2 pulldown that most TVs use as the easiest way to do that so it minimizes the judder that can occur.

thank you .

aramis109 · 08-25-2009, 05:31 PM

To add to what Callas was saying, your TV is displaying the signal's resolution and refresh rate. This is useful since the TV is going to take that signal and upscale it to 1080p and 240hz.

Lavalamp · 08-26-2009, 01:40 AM

that shows you only the info for the signal. You won't see any signal higher than 60 hz. Your tv will take that and do its processing to 240hz.

genkifd · 08-26-2009, 03:57 AM

hz = fps...... refresh rate is a total different thing - normally measured in ms...

sean10mm · 08-26-2009, 04:57 PM

Quote:

Originally Posted by genkifd

hz = fps...... refresh rate is a total different thing - normally measured in ms...

You're confusing refresh rate with response time. Refresh rate is Hz, resposne time is in ms.

genkifd · 08-26-2009, 07:47 PM

hz or fps is the number of frames per second..... 200hz = 200 fps...

response rate is the time that a pixel takes to change - or the reaction time of the pixel....

sean10mm · 08-26-2009, 11:37 PM

Quote:

Originally Posted by genkifd

hz or fps is the number of frames per second..... 200hz = 200 fps...

The frames per second and refresh rate aren't the same thing. You really should shut up and quit posting bogus information.

genkifd · 08-27-2009, 12:58 AM

they are close enough to be the same thing..... in relation to power yes its not the same thing... but we are not relating this to power...

please give me your explaination of hz and fps

maygit · 08-27-2009, 01:19 AM

Quote:

Originally Posted by genkifd

they are close enough to be the same thing..... in relation to power yes its not the same thing... but we are not relating this to power...

please give me your explaination of hz and fps

In a nutshell hz is how many times the screen is updated per second, fps is how many different "pictures" are displayed each second. Now, without motion enhancers the tv will display 24-30 fps and each frame is refreshed/updated 4-5 times on 120hz panels and 8-10 times on 240hz panels. Yes they do work hand in hand but hz=/=fps.

genkifd · 08-27-2009, 01:37 AM

wiki

Frame rate, or frame frequency, is the measurement of the frequency (rate) at which an imaging device produces unique consecutive images called frames. The term applies equally well to computer graphics, video cameras, film cameras, and motion capture systems. Frame rate is most often expressed in frames per second (FPS) and in progressive-scan monitors as hertz (Hz).

callas01 · 08-27-2009, 02:44 AM

Quote:

Originally Posted by maygit

In a nutshell hz is how many times the screen is updated per second, fps is how many different "pictures" are displayed each second. Now, without motion enhancers the tv will display 24-30 fps and each frame is refreshed/updated 4-5 times on 120hz panels and 8-10 times on 240hz panels. Yes they do work hand in hand but hz=/=fps.

Genkifd, this is pretty much correct. Movies are filmed 24 fps and TV is broadcasted in 30 fps. TVs refresh their screens at rates of 60 hz, 120 hz and 240 hz etc. so what happens is a movies frames is reproduced 4-5 or 8-10 times when using a tv with 120 or 240 hz refresh rate. A tv that has a 60 hz refresh rate uses the 3:2 pulldown to display the frames in a 2-3-2-3-2-3 sequence. Hz refers to the number of times the screen refreshes per second.

when a tv is playing a movie at 24 fps, and it is a 240 hz refresh rate it essentially is reproducing that frame 10 extra times per second. This is supposed to work in conjunction with response times so that it reduces lag or blurring.

response time is the pixels ability to open and close in terms of ms(miliseconds), this is the biggest issue in terms of motion blur and what causes it. response times of 8 ms or less, from a normal viewing distance is not (supposed to be) detectible to the eye.

Wikipedia search "24p frames per second" and "refresh rate" if you would like, they will also tell you how it works in term of PAL and NTSC.

I hope this helps, there is a lot of information to digest and the same terms are used with different meanings within the industry which only adds to the confusion.

callas01 · 08-27-2009, 02:46 AM

Quote:

Originally Posted by sean10mm

The frames per second and refresh rate aren't the same thing. You really should shut up and quit posting bogus information.

please educate or give proper information and don't ridicule or belittle someone, you lose credibility that way and its not necessary.

genkifd · 08-27-2009, 10:13 PM

i was expecting some sort of apology.....

pepper83 · 09-16-2009, 03:33 AM

does anybody with this tv has any flashlighting problem??

Memnoch · 12-01-2009, 05:00 PM

I spent the weekend with a 55" Samsung 8000 series LED LCD and didn't have any issues. The picture is so much more amazingly clear and lifelike than any other set that I guess I didn't notice. I have heard of some people noticing these issues, but regardless of any little issues with this TV, I would highly recommend it to anyone searching for TVs this holiday season. It costs a pretty penny, but there are deals everyday on this kind of thing. Just keep your eyes peeled. Gizmodo has a good deal post every afternoon and so do a couple other sites like the consumerist and hot deals in this site's forum.

08-25-2009, 02:46 PM	#1
paulfromtulsa Active Member Member since:Feb 2007	samsung LED and refresh rate question (un55b8000) hello i have a samsung led model #un55b8000. I know that this tv has a refresh rate of 240hz but when i hit the info button on my remote it reads as follows. when watching a bluray it reads 1920x1080p 24hz. hidef channel 1920x1080i 60hz. regular channel 720x480 60hz. my question is what does the 60hz and 24hz stand for and why is it lower when watching a bluray movie? thank you.

08-25-2009, 04:38 PM	#2
callas01 Blu-ray Prince Top contributor Member since:Jun 2008 Location:Riverside, CA Home Theater Gallery:42 Blu-ray collection:230 DVD collection:47	Blu-ray movies play at 24 fps(frames per second) so the screen refreshes at 24hz to match the frames per second, so as to minimize and eliminate any judder that could occur. TV/Cable/Sat and DVDs all play at 30 fps, and using the 60hz refresh rate allows for the 3:2 pulldown that most TVs use as the easiest way to do that so it minimizes the judder that can occur. your 240hz refresh rate is the speed at which the tv refreshes the screen to eleminate motion blur. The reason they use 120hz and 240hz is that they are both number divisable by 24 and 60. So what happens is the screed on a 240hz LCD is that it adds 10 additional frames every 1/24 of a second or 4 additional frames every 1/30 of a second to eliminate "Motion Blur" you can read this article if it helps you. http://www.soundandvisionmag.com/fea...-it-hertz.html Last edited by callas01; 08-25-2009 at 04:58 PM.

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08-25-2009, 05:31 PM	#4
aramis109 Blu-ray Ninja Member since:Mar 2008 Location:Milwaukee, WI Home Theater Gallery:10 4K collection:4 Blu-ray collection:360 Trading Score:18	To add to what Callas was saying, your TV is displaying the signal's resolution and refresh rate. This is useful since the TV is going to take that signal and upscale it to 1080p and 240hz.

08-26-2009, 01:40 AM	#5
Lavalamp Member Member since:Jan 2009 Home Theater Gallery:10	that shows you only the info for the signal. You won't see any signal higher than 60 hz. Your tv will take that and do its processing to 240hz.

08-26-2009, 03:57 AM	#6
genkifd Active Member Member since:Jul 2009 Location:Melbourne, Australia Home Theater Gallery:10 Blu-ray collection:259	hz = fps...... refresh rate is a total different thing - normally measured in ms...

08-26-2009, 07:47 PM	#8
genkifd Active Member Member since:Jul 2009 Location:Melbourne, Australia Home Theater Gallery:10 Blu-ray collection:259	hz or fps is the number of frames per second..... 200hz = 200 fps... response rate is the time that a pixel takes to change - or the reaction time of the pixel....

08-27-2009, 12:58 AM	#10
genkifd Active Member Member since:Jul 2009 Location:Melbourne, Australia Home Theater Gallery:10 Blu-ray collection:259	they are close enough to be the same thing..... in relation to power yes its not the same thing... but we are not relating this to power... please give me your explaination of hz and fps

08-27-2009, 01:37 AM	#12
genkifd Active Member Member since:Jul 2009 Location:Melbourne, Australia Home Theater Gallery:10 Blu-ray collection:259	wiki Frame rate, or frame frequency, is the measurement of the frequency (rate) at which an imaging device produces unique consecutive images called frames. The term applies equally well to computer graphics, video cameras, film cameras, and motion capture systems. Frame rate is most often expressed in frames per second (FPS) and in progressive-scan monitors as hertz (Hz).

08-27-2009, 10:13 PM	#15
genkifd Active Member Member since:Jul 2009 Location:Melbourne, Australia Home Theater Gallery:10 Blu-ray collection:259	i was expecting some sort of apology.....

09-16-2009, 03:33 AM	#16
pepper83 Junior Member Member since:Aug 2009	does anybody with this tv has any flashlighting problem??

12-01-2009, 05:00 PM	#17
Memnoch Expert Member Member since:Jun 2007 Location:Northern VA 4K collection:185 Blu-ray collection:185 Trading Score:1	I spent the weekend with a 55" Samsung 8000 series LED LCD and didn't have any issues. The picture is so much more amazingly clear and lifelike than any other set that I guess I didn't notice. I have heard of some people noticing these issues, but regardless of any little issues with this TV, I would highly recommend it to anyone searching for TVs this holiday season. It costs a pretty penny, but there are deals everyday on this kind of thing. Just keep your eyes peeled. Gizmodo has a good deal post every afternoon and so do a couple other sites like the consumerist and hot deals in this site's forum.

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