I'm trying to get to the bottom of whether any LCDs can actually change their refresh rates, and therefore whether European LCDs can actually display a 24fps signal in a true manner (i.e. with a even pulldown ratio of n:n at 24Hz, 48Hz, 72Hz, 96Hz, 120Hz etc). Please, please help! I've searched and searched and found no definitive answer on this - I can't believe no one seems to know when it's such a major point!
Are the TVs that are sold in Europe as 50Hz/100Hz (and in the US as 60Hz/120Hz) actually the same? i.e. Can a UK TV sold as a 100Hz alter its refresh rate to 120Hz when input with a 60Hz or 24Hz signal (at 5:5 pulldown) or does it do some kind of uneven pulldown to get it to 100Hz?
I've seen arguments both ways - those who say LCDs can't change their diplay refresh rate insist all LCDs simply always run at their max refresh rate - in which case even 50Hz Euro TVs that claim to be able to display true 24p refresh rates are actually using some kind of 3:2 pulldown. Those who claim this also say that the only TVs available that can truly display a 24p output correctly are 120Hz or 240Hz TVs that display 24p on a 5:5 or 10:10 pulldown. If this is the case - how does the fact that US 120Hz TVs are clocked at 100Hz in Europe affect this? If the advocates of LCDs only have one refresh rate are correct, then surely the European 100Hz TVs will not be able to perform 5:5 pulldown (neither will UK 200Hz TVs be able to perform a pure 24p pulldown) and therefore no one in Europe can really see 24p output!
Then there are those who claim that certain LCDs can change their refresh rate. In which case you have 50Hz TVs that can run at 48Hz to show true' 24p, and 100Hz TVs that can run at 96Hz to do the same).
I currently own a Samsung LE40N87BDX which I was always under the impression could take a 24p input and display it correctly (at 48Hz I believe). Reasons I take this to be the case include the facts that:
1) The TV display indicates 24Hz when the TV is being force fed a 24p signal (though this could of course merely refer to the input signal)
2) I'm fairly sure I can detect a difference in the picture/judder when playing Blu-Ray via a PS3 on the forced 24p mode and the 50Hz mode. 24p is smoother - 50Hz has 3:2 pulldown judder..
3) The presence of the infamous Samsung hum bars during 24Hz mode - they are only present during this mode, indicating something certainly is different with the TVs display.
But I may be wrong of course!
Some background on this argument (with no definitive answers!) can be found here:
http://www.avsforum.com/avs-vb/showthread.php?t=1161285
Can anyone who really knows their stuff (or thinks they might!) help settle this once and for all?
Help! Help! Help! Please!
Are the TVs that are sold in Europe as 50Hz/100Hz (and in the US as 60Hz/120Hz) actually the same? i.e. Can a UK TV sold as a 100Hz alter its refresh rate to 120Hz when input with a 60Hz or 24Hz signal (at 5:5 pulldown) or does it do some kind of uneven pulldown to get it to 100Hz?
I've seen arguments both ways - those who say LCDs can't change their diplay refresh rate insist all LCDs simply always run at their max refresh rate - in which case even 50Hz Euro TVs that claim to be able to display true 24p refresh rates are actually using some kind of 3:2 pulldown. Those who claim this also say that the only TVs available that can truly display a 24p output correctly are 120Hz or 240Hz TVs that display 24p on a 5:5 or 10:10 pulldown. If this is the case - how does the fact that US 120Hz TVs are clocked at 100Hz in Europe affect this? If the advocates of LCDs only have one refresh rate are correct, then surely the European 100Hz TVs will not be able to perform 5:5 pulldown (neither will UK 200Hz TVs be able to perform a pure 24p pulldown) and therefore no one in Europe can really see 24p output!
Then there are those who claim that certain LCDs can change their refresh rate. In which case you have 50Hz TVs that can run at 48Hz to show true' 24p, and 100Hz TVs that can run at 96Hz to do the same).
I currently own a Samsung LE40N87BDX which I was always under the impression could take a 24p input and display it correctly (at 48Hz I believe). Reasons I take this to be the case include the facts that:
1) The TV display indicates 24Hz when the TV is being force fed a 24p signal (though this could of course merely refer to the input signal)
2) I'm fairly sure I can detect a difference in the picture/judder when playing Blu-Ray via a PS3 on the forced 24p mode and the 50Hz mode. 24p is smoother - 50Hz has 3:2 pulldown judder..
3) The presence of the infamous Samsung hum bars during 24Hz mode - they are only present during this mode, indicating something certainly is different with the TVs display.
But I may be wrong of course!
Some background on this argument (with no definitive answers!) can be found here:
http://www.avsforum.com/avs-vb/showthread.php?t=1161285
Can anyone who really knows their stuff (or thinks they might!) help settle this once and for all?
Help! Help! Help! Please!