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Ask Slashdot: Does LED backlight PWM drive you crazy too?

jones_supa (887896) writes | about a year ago

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jones_supa (887896) writes "I would like to raise some discussion about a hardware issue that has increasingly started to bug me during the recent years: backlight flicker which many LED-backlit monitors suffer of. As you might know, the backlight and its dimming is driven by a pulse width modulated square wave, essentially flicking the LEDs on and off rapidly. Back in the CRT days a 100Hz picture was deluxe, due to the long afterglow of the display phosphor. LEDs, however shut off immediately and my watering eyes and headache tell that we should be using frequencies in multiple kHz there. Unfortunately we too often fall behind that. As one spark of hope, the display review site PRAD has already started to include backlight signal captures to help assessing the problem. However with laptops and various mobile gadgets, finding this kind of information is practically impossible. This issue sort of lingers in the background but likely impacts the wellbeing of many, and certainly deserves more attention."

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