Questions regarding FlatpanelsHD reviews will be answered here.
User avatar
By Rasmus Larsen
#11574 People sometimes ask me if modern LED based LCD TVs still use PWM to modulate the backlight brightness level. Some people perceive PWM as very high-frequency flicker.

So I checked for PWM on both Panasonic EX700 and Sony X85E (review coming later this week).

As you can see in the photo below, Panasonic EX700 does indeed use PWM. The photo was shot with a 1/25 sec exposure time and there are 10 lines so PWM operates at 10*25 = 250Hz.

Image