25 Feb 2015, 13:47
#7155
Hdtvtest mentions flicker on BFI (black frame insertion is used only in Samsung & Sony) : http://www.hdtvtest.co.uk/news/ue65js95 ... 234012.htm
This BFI flicker is different from PWM induced flicker ?
The PWM test is very simple to do by selecting a faster shutter speed on the camera.
The only problem is how are you going to differentiate in case there is both PWM and black frame insertion induced flicker ?
These two should be different but ....
"Strobing, by its nature, is PWM. Simple black frame insertion (via backlight) is a very simple form of PWM that is synchronized to the refresh rate, not used for dimming, but used for motion blur elimination."
So PWM is used as black frame insertion on Samsung and Sony models by default ? Panasonic and LG also use a partial back-light scanning so PWM is necessary in those cases ?
The monitors without PWM are really relaxing because you can lower the brightness and have absolutely no flicker, unfortunately this is not the case with TVs, because the panels use PWM and since they were very slow panels up until 2014 Sony models came up, they needed this PWM Strobing in the form of PWM to compensate.
Maybe 2015 1080p models will be much faster and no longer need PWM.
BFI as stated in the bold paragraph is synchronized to the refresh rate, not used for dimming so both PWM and BFI should exist at the same time ?
This BFI flicker is different from PWM induced flicker ?
The PWM test is very simple to do by selecting a faster shutter speed on the camera.
The only problem is how are you going to differentiate in case there is both PWM and black frame insertion induced flicker ?
These two should be different but ....
"Strobing, by its nature, is PWM. Simple black frame insertion (via backlight) is a very simple form of PWM that is synchronized to the refresh rate, not used for dimming, but used for motion blur elimination."
So PWM is used as black frame insertion on Samsung and Sony models by default ? Panasonic and LG also use a partial back-light scanning so PWM is necessary in those cases ?
The monitors without PWM are really relaxing because you can lower the brightness and have absolutely no flicker, unfortunately this is not the case with TVs, because the panels use PWM and since they were very slow panels up until 2014 Sony models came up, they needed this PWM Strobing in the form of PWM to compensate.
Maybe 2015 1080p models will be much faster and no longer need PWM.
BFI as stated in the bold paragraph is synchronized to the refresh rate, not used for dimming so both PWM and BFI should exist at the same time ?